like damn dude. he told you to stop multiple times. i really wasn't expecting this from seo-an. i know he has issues. they both do, but the most they can do is talk it out instead of acting on impulses (which yeah if it's an impulse it's hard to not do but still).
and to top it all off he hasn't been talking to him properly and making plans by himself for a while now. so woo-won is the one that has all the right to be upset. but he's just worried about seo-an