Responses
It is regret, guilt and unprocessed grief, not love. Heejae finds himself in the same situations as before and this time tries to behave differently to prevent the same outcome. If Garam were to leave, he would lose everything, which is partly why Heejae does all of this for him.
I fawking knew it. That's why i hate lost lover trope. He is projecting his love for that man on garam????? The professor better be getting some crazy redemption or garam be getting with someone else.