Stupid twist with a stupid storyline.
A man's life wasted just like that because he cared for a woman who was abused in her past relationship.
The past relationship he himself came to a halt cz his gf committed suicide and her sister made a baseless inference that he was the one behind it.
She teamed up with another girl (male lead's fateful love) to fulfill her desire to gain closure and justice by killing the guy instead of actually investigating the situation.
His ex-gf could have committed due to a million other reasons but NO, as this is a Korean drama and men are worms cz feminism ? so, he must die. Lol. Worthless, Don't watch.