BLreviewer

This was the most bizarre drama I have probably watched in years. It started as a slice of life/student first love cute bl, then there was a forced separation followed by misunderstandings and then Lu Feng becomes an obsessed stalker who kidnaps and assaults his ex lover. Many other good reviews have made accurate points, so I will write something that wasn't said before.
Lu Feng had the potential to become a yandere as great as Gasai Yuno (from the anime Mirai Nikki) and the horrendous writing ruined him. What do I mean:
If you are familiar with the yandere trope, the obsessed stalker will go above and beyond and will have no problem committing crimes in order to get the object of their objession. Yandere characters are psychopaths and Lu Feng had many such traits, but they made him extremely lukewarm. Imagine how much more intense the show would have been if he just threw his father down the stairs and took over the company or just killed him when his father tried to beat him or even killing Yi Cheng's family or kidnapping Yi Cheng from the very beginning!
Also yandere characters are sexually faithful and they have no desire for flings. Lu Feng bringing random men to his house because "he is a man and he has needs" was disgusting and a turn off and also unfair to the random people selected to be his playthings until the eternally indecisive Yi Cheng made up his mind. The show should never have gone down that road.
I disagree with the comments that say that Yi Cheng should have been more charming or that the characters should have known more about each other. In yandere stories most of the receivers of the stalking aren't insanely charismatic, they are usually cute/reserved or have one encounter with the stalker that causes limerence and everything unfolds from there. The stalker fills up the gaps with their fantasy anyway. The problem with this drama was that Yi Cheng's confusion lasted too long since no major incidents happened in years. If Lu Feng have been on a killing spree he would have been forced to have some character development towards either direction.
The office drama era gave the drama the chance to be saved without the killing spree. Lu Feng returns as the CEO, they reunite and it would have ended at episode 5-6 with them living and working together and it would have been beautiful and satisfying. The bipolar ending was ableist. People with bipolar disorder are already discriminated against, there is no cure currently only life long management and being bipolar doesn't make someone a) a stalker, b) a fuckboy, c) a kidnapper, d) a rapist. Those are psychopathic traits and there is no cure for those. I support the promotion and discussion of mental health issues, but not in this drama. Lu Feng should not have been forgiven for the sexual assault/kidnapping because "he was bipolar and couldn't help it". Since they didn't want to end it as a fluffy office drama, I would have let him be a deranged psychopath and made Yi Cheng decide that he can't live without him and they should just sell the company, move to the US where no one knows them, get married and live in peace.
The actor who played Lu Feng was phenomenal and carried the show.