Change.

As mentioned, after receiving the clothes, he takes WonPil and they go to wash at the river. They choose a different spot, southern from where they take the water for drinking, of course.
WonPil doesn't wait a second, the takes off the robe and, completely naked, enters into the deeper water. «It is less cold at this time of the day!» Sun is about to set.
Chan is a little worried to take off his pants, he fears some accident being all naked with WonPil in the water, but eventually decides to take them off and hurries to join in the water.
«This feels good!» WonPil says cheerfully, splashing around.
Chan smiles. He has not seen the other so well since they were taken away from Earth. It makes him happy to just see WonPil like that. «It is good to finally throw away those ragged things and wear something full.» He snorts.

WonPil approaches the shore and takes all the clothes they took off. «We shouldn't throw them, they can always be useful. Plus, nothing of these is mine…» He starts to wash Jager's robe and Shige's cape, also Chan's pants.
He approaches WonPil a little, but the other suddenly freaks out at something and literally butt-crashes against him.
Chan hurries to turn around at the speed of light, not to let the other realise that the impact had a certain… effect on him, down there. He holds his breath, awkward to death.
«Oawh… a fish bit me in the leg!» says WonPil, turning around and blinking. «Gwaenchanha?» He taps his finger against his back.
«Ye, gwaenchanhayo, I'm just… was trying to catch the fish…» He can't control his embarrassed and weird tone.
«Arasseo… are you sure that the fish didn't bite you too?» He snickers. Luckily he is slow.

After washing, Chan literally jumps out of the water to get dressed as fast as possible, without the other noticing his sausage.
Thankfully, WonPil comes out after Chan is already fully dressed and quietly dresses up in the new clothes too. He thinks they are Chen's, since they were from his sack.
They return to the cave and the rest of the evening goes more or less as usual.

When they are about to go to sleep, Chan comes to WonPil with some leftover fish in a leaf. He sits next to him. «Have some more…»
WonPil, who is curled up at the bottom left corner of the cave, on the big bedding leaves, looks at Chan. «But I had my part…»
«I saw that you had less than the others. You should eat some more. You are the youngest…»
«But… you barely had anything. You always eat the least, you should have it.»
Chan snorts. How to explain him that he doesn't need as much food as the others, without telling him about how. «You guys said I am the leader. So I decided that you must eat this!» He suddenly presses the leaf against WonPil's mouth and snickers.
«Wwhh!!» The other has no choice but to eat the fish. «It is not fair though… others had lesa fhan me, like the new guys…» He glances at Shige and Cloud.
«Tomorrow they will have some more, ok?»
«Deal!»

WonPil falls asleep shortly after.
Chan usually only sleeps a few hours when everyone else is awake.