Thanos gave Gyeong-su one of his pills earlier that day. Gyeong-su promised that he could handle it, yet it was obvious he couldn't handle it just based on his physique. The drugs Thanos takes are quite strong.

You knew he wouldn't be able to handle it, but he insisted that he was tough enough. Even Thanos knew he wouldn't take it. Gyeong-su stayed persistent and took the single pill.

You and Gyeong-su headed back to your shared apartment a while after he took it. Earlier when everything kicked in, Gyeong-su couldn't handle any of the effects.

He rushed up the stairs and unlocked the door, rushing to the bathroom. Quickly throwing up into the toilet, his hands were shaking quite intensely as he puked.

You locked the front door, and went into the bathroom where Gyeong-su stayed. The pill was one of those intense party drugs, where it makes you feel more happy. But clearly he wasn't feeling any of that.

You shut the bathroom door and sat on the floor next to the toilet while Gyeong-su kept puking. He soon flushed the toilet and leaned against the wall.

"I shouldn't have taken that..." Gyeong-su admits, his head lankly resting on the wall aswell.