This cliffhanger came out of nowhere and didn't make any sense. It felt so superficial. The plot literally had nothing of importance left, MC is a god already, winning every girl's heart, the band working flawlessly, his evil dad instantly became an angel. This drama with his sister just felt so forced. There was nothing interesting happening so dev had to make a parlor's trick to create superficial drama.
I'm not even talking about details and how he brought the gun in the first place, how the beta guy who had zero problems with MC's band and was only following his alpha band leader, becomes the one to go bonkers? Even though his alpha friend who the beta guy was following along for his sake, saying drop the gun? He still does it. It felt so superficial and forced.