Firstly let me say the scriptwriting, acting, and filmography was outstanding.

Then let me follow it by saying, freaking... why?
Tae is completely unlikeable as a character. He is self-involved, narcissistic, and selfish. He treats Oh as if he should be grateful for being there and then punishes him when he doesn't meet the standards he wants.
At times it is almost a narrative of emotional abuse and then he cheats on him, begs him to stay, and in the end... what? Just, no. Runaway, Oh'Aew, run far away. That boy is a toxic wasteland. I don't care how much the writer wanted to give watchers a happy ending. That was just unhealthy.