This relationship is a mess... my gosh. So they talk it out, and he finally tells Sijun about the teacher's involvement (and possibly that the both dated, but sounds like he didn't). And Sijun finally gets to properly reacts like he should about their breakup, but he forgives Min just like that?
If anything the two just need a break or to avoid dating in general. This emotional abuse needs to stop.
With all the names, I got the murderers mixed up, who was Xue Yu again?
Cause I think towards the end Jiang Sijun's name is being thrown around, it got mixed up a bit.
Xue Yu was the boyfriend of Yuan Mu originally. He got mixed up with Jiang Sijun, but because Jiang Sijun was the main culprit in the whole plot, I think that's why his name was used so much. They were talking about how much he liked Xue Ye and wanted to be exclusively to the point of manipulating him into thinking that he would lose everything if he stayed with Yuan Mu.