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The Overview of Plot and World building:

Ancestral God created and divided the universe into three realms... God Realm, Immortal/Heavenly Realm and Demon Realm, where God Realm is supreme. There is also Nether World where devils are imprisoned...

There are countless gods and immortals but only four are True Gods who commands the God Realm and are responsible for management and safety of Three Realms... Zhi Yang, Bai Jue, Tian Qi and Shang Gu. They all are born from the same origin but Shang Gu is "Supreme True God" who possess the Power of Chaos and the only girl and youngest one among them, just 10,000 years old. Zhi Yang, Bai Jue and Tian Qi grew up together and have very strong bonding.

• The hierarchy of God Realm:
1. Supreme True God/Chief God of Chaos
2. Three True Gods
3. High Gods
4. Lower Gods
5. Disciple from Immortal/Demon Realm

• The hierarchy of Immortal Realm:
1. Heavenly Emperor and Empress and High Gods
2. Demi Gods
3. Senior Immortals
4. Junior Immortals
5. Other Immortals

• The hierarchy of Demon Realm:
1. Demon God
2. Demon Emperor
3. Demi Gods
4. White Tiger Clan
5. Fox Clan
6. Other Demon Clans

The drama follows the story of Shang Gu and Bai Jue and show how their deep love and relationship developed and progressed while bearing the responsibility of safety of three realms and dealing with countless hardships.

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Introduction to Key Characters:

Bai Jue/Bo Xuan/Qing Mu (Xu Kai): Bai Jue, a True God and the God of War... The origin of his powers is Immortal and Fire, so he is also God of Fire. Has a stoic, distant and cold personality... No one can match upto his wisdom and patience...and his determination and dedication towards responsibilities and love is unmatched. Bai Jue grew up cultivating hard with Zhi Yang and Tian Qi and fighting devils to protect the Three Realms. Tian Qi nicknamed him as "Ice Cube" because of his cold demeanour... Despite him being distant, he was still admired and pursued by many goddesses in God Realm.
Weapon - Tai Cang Spear
Divine Beast - Hong Ri (Fire Qilin)
Residence - Abyss Hall and Daze Mountain

When God Realm closed due to Tribulations of Chaos, Bai Jue adopted the identity of Bo Xuan and lived in the Qing Chi Palace in the Immortal Realm for almost 60000 years, hiding his True God identity and isolating himself from all others, only Gu Jun knew his true self.

Qing Mu, a aloof and reserved young immortal from North Sea of Immortal realm, whose origin is unknown and he don't like to socialize. He got fame for his powerful cultivation despite his young age of only 1,000 years, and titled as "Lord of North Sea". He looks like Bai Jue who has disappeared years ago.
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Shang Gu/Hou Chi (Zhou Dong Yu): Shang Gu, the Chief God of Chaos, a mischievous and fun-loving young Goddess meant to be the Supreme True God. She was raised and spoiled by Zhi Yang, Tian Qi and Yue Mi. Despite having Chaos Origin, her cultivation and powers were weak so she was being bullied by others.. Bai Jue was tricked by Zhi Yang to being her teacher. Because of her undisciplined and arrogant personality, she despised strict and disciplined Bai Jue from their very first interaction.
Weapon - Ancient Sword
Divine Beast - Wu Huan (Five-colored Pheonix)
Residence - Pilgrimage Hall

Hou Chi, the born High God and daughter of Gu Jun. She has aloof and cold demeanour but a warm heart. Raised in Qing Chi Palace in care of Bo Xuan and Feng Ran. Her Godly powers are weak and she shows less to no improvement in cultivation, even after diligently practicing for 60,000 years. She looks like Shang Gu who died in Tribulations of Chaos.
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Tian Qi/Jing Yuan (Liu Xue Yi): Tian Qi, a True God, his power origin is Demonic and Water, so he is also Demon God and the God of Water. A carefree, mischievous and fun-loving God but a little impulsive and sometimes narcissist.. haha! He and Shang Gu have similar personalities... He manages Demon Realm... Tian Qi values relationships and friendships more than anything else...and likes to arguing with Bai Jue, but in a good-natured way. He loved Shang Gu and would do anything for her, even destroy the three realms he had been protecting his entire lifetime.
Weapon - Purple Moon Whip
Divine Beast - Zi Han (Dragon)
Residence - Everlasting Hall

Jing Yuan, the Demon Lord Zi Yue, is actually another identity/reincarnation of Tian Qi after the Tribulations of Chaos. He lived in Demon Realm in seclusion and apart from Zi Han, only Demon Emperor knew who he is in real.
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Zhi Yang (Li Ze Feng): The calm and rational True God... He is incharge of the affairs of the Three realms...and the oldest one in all True Gods...
Weapon - Twin Spear
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Wu Huan (Zhang Jia Ni): The low-ranked pheonix from Wutong Island, whom Shang Gu picked up as her divine Beast instead of "the Only Fire Pheonix and Pheonix Queen" Feng Yan... She used to be kind, humble and calm before but later on became an arrogant, cunning, heartless and thirsty for power.... She is one of the three Ancient High Gods of Immortal Realm and the Heavenly Empress...
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Gu Jun (Leon Lai): A Flood Dragon from Demon Realm.. and the only disciple of Shang Gu... He is a loyal and wise person... Gu Jun is one of the three Ancient High Gods in Immortal Realm who survived the Tribulations of Chaos... He is the master of Qing Chi Palace and former lover of Wu Huan...
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Yue Mi (Luo Qiu Yun): The Goddess of Stars and Moon in God Realm and best friend of Shang Gu... She is wise and powerful but fun-loving Goddess and very close to all the True Gods... She was in love with Tian Qi but her feelings were not yet reciprocated...
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Feng Ran (Zhang Ya Qin): The only alive Fire Pheonix and daughter of Feng Yan... A straight-forward and cleaver girl... She is the best friend and protector of Hou Chi..and attendant of Gu Jun (whom he saved from Yunlin Swamp)... She is way powerful than Hou Chi and in-charge of Qing Chi Palace in the absence of Gu Jun.

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Acting and Chemistry:

Xu Kai and Liu Xue Yi's portrayal of their characters is breathtaking...

Xu Kai was great as Bai Jue and Qing Mu although I don't like Bo Xuan's part much but it was good as well. As Bai Jue, he acted well as a cold and distant God who treats everyone fairly but can silently sacrifice his all for his love, and as Qing Mu, he did amazing as a aloof Immortal who knows to pursue his love without concerning the world... Xu Kai made the two characters really different with his acting skills that you won't feel these both characters played by one single person. He made Bai Jue my favourite character...

Liu Xue Yi impressed me with his remarkable performance. Tian Qi is my favourite just after Bai Jue... and I am so grateful to makers to not turning him in "typical toxic second male lead" who is obsessive... He loved Shang Gu but knew what are the limits and when to give up...

Zhao Dong Yu was amazing as Shang Gu in the first and last arc of the story but I feel her acting plain as Hou Chi.

Zhang Jia Ni did an extraordinary job with her character.. she truly made me hate Wu Huan from the bottom of my heart that I wanted to slap her everytime.

The chemistry between leads can be considered decent and above average... I loved the chemistry between Feng Ran and Jing Jian.. it was just wonderful.
The relationship dynamics between Bai Jue and Tian Qi are very interesting and fun to watch...
Other actors also did beautiful job with their characters and are worthy to be praised...

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OSTs, Costumes and CGI:

OSTs are pleasant and extraordinary.. these have secured the top place in my playlist. The lyrics fit the story and scenes perfectly and make me cry every time I listen to them... "A Thousand Years of Search" and "The Thought of Life" are my favourite.

"I am willing to search for thousands of days and nights; Waiting for time to meet again in your eyes..
Exchange a lifetime for a second of encounter; It would not be a pity if it can be accomplished.."
~A Thousand Years of Search

Costume are really beautiful and gives a aura of grace and divinity.
CGI is top-notch. The magic spells, the power from the divine weapon, the sets, all look real, natural and beautiful.

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Conclusion:

Ancient Love Poetry signifies the patience, dedication and loyalty in love without compromising the duties and responsibilities one has to fulfill.
The wait of sixty thousand years and dedication of Bai Jue for his love Shang Gu along with his devotion for duties towards the three realms are exceptional and heart-touching. I'm actually very tough to cry while watching a drama.. but this made my tears rolled over my cheeks, even after rewatching it many times I still feel the same heartbreak every time.

"She turned to ashes,
separated by life and death;
He protected the three realms for her..
The thought of life is still ringing in my ears;
Once again, this passion has no limits and will never be extinguished"
~The Thought of Life

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Ending:

I was thinking it would be a drama with a sad ending, but the ending touches my heart. It was a beautiful happy ending that I never expected.

To be honest, it might feel a bit boring to many in starting and one could feel like dropping it.. but I recommend to must watch at least 8 to 12 episodes before you make the decision to drop, otherwise you'll miss a fabulous drama.
I would recommend everyone to give it a shot.