Basically Geonmu, his brother, and Jay used to work together. Shit goes down, brother got shot or something, and Jay is like hey Geonmu we gotta leave before we die too and takes Geonmu with him. Geonmu feels guilty they left him. It's assumed he died. Geonmu stays working with Jay to find this red diamond. Jay believes Taeoh is tied to the diamond. So Geonmu gets close to him. They get the hots for each other. Taeoh lies about who he is, Taeoh finds out he's lying but still likes him and just wants to know whats going on. Geonmu won't tell him. Crystal is Taeohs cousin or something and helps them. I think she has ulterior motives but not sure. Oh and the brother is obv not dead, but psycho. He always was. But Geonmu has a brother complex or something so he keeps doing what he says because they're "family" (ew) and also doesn't want Taeoh to get hurt now.

I should've reread, I forgot everything that happened