Although there were some changes to the immortal arc, and the ending of this drama probably due to restriction and limitation of episode.
Here is a brief of the novel ending, May be can help some to find a closure.
The novel ending: they reconciliation happened about 1000 years later. The three realms were peaceful after TTJ’ sacrificed. LSS ruled the demon world and searched for TTJ’s soul at Nether River but she couldn’t find him. LSS wanted to die but she didn’t because she was pregnant with their daughter, and Ami was born.
The abyss (after TTJ”s death, is transformed into a livable place for all creatures and demons.) LSS never give up in searching for TTJ. Ami, is a full God because of her parents’s status. TTJ transformed the abyss into the nature world that LSS loves, making it inhabitable for the demons. Ami is playful and adorable and had cheekiness of TTJ.
One day, Ami sneaks out and stumbles upon a new reincarnated TTJ in mortal world, reborn as Bai Ziqian. BZQ kept a low profile and determine to live a simple life (one if the hopes LSS wanted him to do). BZQ initially had his memory locked so he couldn’t remember LSS but he is attracted to her. LSS opened a wine shop near in his village and started to pursue him.
Eventually BQZ regain his memories of his past lives and remembers everything but did not seek LSS because he thought she is a goddess now and is more prestigious in her status. He thought she is serving the good of the world. It turns out LSS knew everything that happen and his sacrifice. She spent most of her time tracing TTJ’s whereabouts without knowing he had reborn in a remote town as a human.
It is in this town LSS schemed to win over BZQ. He finally gave in and married her. LSS knew from the first encounter that BZQ is TTJ when she saw him.
On their wedding night, LSS asked her BZQ, who she should refer him as: TTJ OR BQZ. After the wedding, she brought him home to the abyss where everyone welcome him back. He finally has a place to call home/family. Something he desperately wanted too when he was TTJ and CJM.
There were a story arch in the novel that a young susu promised to take CJM ‘home’ no matter. When they left the portrait enchantment, LSS do not have the memory of the promise which sadden CJM. So the novel ended with LSS keeping her promise to bring TTJ ‘home’ and start their lives there.
The end.