Y'know what? I really don't understand why the author wanted to have this another season. But I also guessed that maybe the author wanted to expand more since the grandfather was shortly introduced. Now given that irl, some ppl are homophobic asf and we know that. Then adding the part that he wants his grandson to become normal and proper cuz his Mom raised him bad... Which is not. He's finding a reason (again, like from their past) to conquer Taesung's world by hurting his beloved one.
But then again (lmao) this season is so **unpractical**... I feel like the author wanted to play more with this story. We've been deadling BL angst in some stories since then now why adding this up lol.