[SPOILERS] Despite the great acting I personally could not understand how they got back together. Not only did ML cheat on her leading to the point of her suicide, but his family was also unbearable to her. FL lacked self-respect; she always listened to her mother-in-law's degradation, even bowing to the mistress to avoid losing her husband. Moreover, the reason why ML and FL drifted away was stupid, her being good with her job had no correlation as to why her child died. I genuinely thought that ML was an antagonist as he literally begged his father to divorce FL and sang the song that was significant to FL to the mistress.
The most irritating part is how people like the ML. He is insufferable; leading on the mistress and then discarding her once he got the high off of her. I think what's truly sad is how the mistress received all the karma. I believe that ML should have received some form of consequence but instead he relentlessly stalked his “(ex)wife” with amnesia neglecting the mistress he abandoned FL for and STILL managed to get FL in the end. Also, ML is absolutely disgusting in how he hit FL and was angry at her, even though he is the one who cheated. The logic that the FL was "being too cold" or "did not give him enough love" is not acceptable, especially when he did not support her during the grieving process for their child. Typically, I don't prefer the second lead, but the FL should have definitely chosen him as he not only helped her in times of hardship but also understood her.
Overall, I would not recommend watching 50 episodes for a relationship built on mistreatment, dead nostalgia, and incompatibility.