Recommendations

Both stories are located in traditional Japanese sweet stores with a long history. Although both have different genres as "Watashitachi wa Douka Shiteiru" is a murder mystery and "Fukuyado Honpo" is a romantic comedy, they both focus strongly on the traditions involved with Japanese arts and the duty of the younger generations to inherit the long standing businesses and continue the family legacy. In both shows you will see tea ceremonies, beautiful and tasty looking sweets and plenty of people wearing kimonos.

A bunch of spoilers ahead, beware
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*Male lead with strong will and entrepreneur mind.
* Multiple couples, office romance and reunion of first lovers.
* Slow burn romance with a long period plot.
* Envious and Dirty enemy.
* Fall from grace, male lead frequent humiliation.
*Jail inmate comes backs to society.
* Economic espionage, corporate spying or corporate espionage.
* Constant usage of technology while working.

There is even more, but the listed are enough!

Cellphone app Love Alarm is created. If someone likes you and they are within 10 meters of you, the alarm for the app rings. The app also shows how many people like you, but the app doesn't reveal specific details on who likes you. Kim Jo Jo is a high school student. She is pretty and smart. She seems like a cheerful person, but her parents died when she was young. Since the death of her parents, Kim Jo Jo has lived with aunt's family. Living there is not easy for Kim Jo Jo. She doesn't download the app Joalarm as her phone isn’t new enough. Meanwhile, Hwang Sun Oh is a popular male student at the same high school where Kim Jo Jo attends. He is the son of a wealthy family, but he is not loved by his parents. His best friend Lee Hye Yeong also attends the same high school. Hwang Sun Oh notices that his best friend Lee Hye Yeong likes Kim Jo Jo. Hwang Sun Oh wants to know if his friend really likes her, so he kisses her.

Dating app. Cellphone app Love Alarm is created. If someone likes you and they are within 10 meters of you, the alarm for the app rings. The app also shows how many people like you, but the app doesn't reveal specific details on who likes you. Kim Jo Jo is a high school student. She is pretty and smart. She seems like a cheerful person, but her parents died when she was young. Since the death of her parents, Kim Jo Jo has lived with aunt's family. Living there is not easy for Kim Jo Jo. She doesn't download the app Joalarm as her phone isn’t new enough. Meanwhile, Hwang Sun Oh is a popular male student at the same high school where Kim Jo Jo attends. He is the son of a wealthy family, but he is not loved by his parents. His best friend Lee Hye Yeong also attends the same high school. Hwang Sun Oh notices that his best friend Lee Hye Yeong likes Kim Jo Jo. Hwang Sun Oh wants to know if his friend really likes her, so he kisses her.

1) Both dramas involve time travel & parallel worlds (In Alice the time travel is explained scientifically whereas in The King it is more of a fantasy)
2) Both have romance & destiny elements
3) Both of them have police involved in time travel
4) Both the main leads seek revenge for their parents death
5) Both of them have good visual effects

Similarity:
1-Both of them have serial killings in the past.
2-Both dramas are about to find the serial killers.
3- Both the main characters are cold and show their affection to only their loved once.

Difference:
1- In Flower of evil, Do hyun soo has a family and in Nobody knows, Cha young jin considers ko eun ho her family.

(If I add point 2 it would be consider as a spoiler so I won't add it. However both of these dramas are amazing. they are MUST WATCH!!!)

Both have a nice team work among the heroes
Both have a common member as vilain
Both have a very supportive and brave female lead
If you enjoyed the quest mission in The Eight ,you will like Maiden Holmes

Both have quests to complete
Both female lead are always backing up the main male
Lead
Both had a team to to work with them
Both have good martial arts action
Both have a close personality as vilain
The only difference is The Eight has a happy ending compared to Martial Universe

Posing as a School student, is really a murderer. I found both movies to have similar feels and were overall good watches.

Both of the dramas are set in the republican era with a hint of mild romance. Both drama focuses on crime-solving and how the leads build up trust and reliance with one another.

Two men who will do anything to protect each other even if they are on opposing sides. The bromance is strong in these two dramas.

Both movies show the harsh conditions of a Filipino jail. They also explore homosexual love between inmates.

Both movies are about juvenile delinquets running amuck and causing trouble.

Both are Filipino movies about a young man having a rough go in prison.

The fight between North and South Korea. The innocent young men and women life lost. The lack of communication, the royalty, the team work, the fight for country, the team work. The leadership, commanding effort. Love and respect. Duty called.