Love song in winter can be considered a great modern cdrama that came out this year. It has a mix of both romance and mystery which tbh is nicely executed. The story in my opinion has good pacing. No character seemed irrevelant in the drama. You know when there are just random side couples. Let's discuss the character's of Love Song in Winter.

Lu Yan is an anesthesiologist and Jiang Chengyi is a detective. They both reunite 8 years after their breakup. I found their relationship mature. They did have communication problems but still in later episodes they talked through it. They really went through too much. Lu Yan felt guilty for so many years for thinking she pushed her best friend to death while JC was hurt from their sudden breakup. Lu Yan is courageous for going through the death of her close friends 2 times, having to stay away from your loved one. You could say even if the circumstances were not peaceful, their relationship was; once they got together again.
Wen Peng was suspicious from the start. Many secrets about him was unexpected though. Him being beaten by his dad and thinking his mom abandoned him turned him to the worst. THE ABUSED BECOMES THE NEXT ABUSER. This quote came to my mind watching him. He could have taken a different path when he turned adult but him killing Deng Man, Ding Jing, trying to hurt close people around Lu Yan is not forgivable. He hated his mother even when she tried to reconcile but could never stand up to his father. Lu Yan showed up when he was about to end his life and he held onto her. He did not love Lu Yan he wanted someone to love him. He was a manipulator who destroyed too many lives.
Deng Man was very naive. Believing Wen Peng and shooting a video which basically solidified her suicide. She mistaked Zou Zhi Cheng's goodwill towards her to be intimate affection. ZC did not intend to do so at first but he did cheat on his paralysed wife with DM. He says he is a human being and he indulged himself just once but that does not justify his cheating. He stood by watching DM being bullied when he could have come forward and stopped it. He was the adult. He should not have such a relationship with a student. Deng Man did not reveal their relationship till the end but that lead to Lu Yan thinking she killed herself because of her. She may not have deserved her death but she was an accomplice in harrassing Lu Yan.
Ding Jing is another character who could not accept rejection. To get Jiang Chengyi she bullied DM into breaking them up. Again, she did not want DM to get killed but her maliciousness towards Lu Yan surfaced later. Her hiring pervert to take pictures of LY and saying that persong could do whatever he want with her. This made me hate her to the core. There was no excuse for this.
What I liked about this drama was that every criminal was punished in the end by law. And they did not push the climax till the last episode. There was proper closure. It may have been boring to many viewers however I liked the drama's setting.