
Here you go https://toonkor431.com/영원한-계약

You can check my other reply for the raws link. But basically he chases him and forces him into a dead end of sorts. He uses his power to give a fatal wound to Brian. He's a true psycho, it's sad seeing that scene and realizing how much of a piece of shit he was to look for Ian, the reincarnation when he's the one who killed Brian.

I think in the season 1 flashback of soleil (sorry if the name is incorrect) I saw Brian dying in a cold space (it was covered with snow) and soleil was crying while Brian was dying but bro tbh I think some people don't like Brian but I like him ofc I don't want Ian to suddenly act like Brian because Ian is a total different person from my perspective and remember in season 1 last chapter it was soleil who's telling about the past to Ian so this doesn't mean that Ian got his memories back its actually soleil who's telling the story to Ian because Ian wanted to know
Read the raws and it's very sad how he died. Brian tried his hardest to runaway and escape that fucker but it was too late. I personally liked that season 2 was mostly if not all of the background story not just for Brian but the twin dragon brothers too. I'm always here for seeing more BL manhwa going past 100+ chapters and actually being consistent with the story telling.