random lu guang thing ever

(please don't mind if it's badly written, first post here as a link click fan haha so it's def not the best)

Might contain few mild spoilers

Is it me or LG has the WEAKEST immune system ever? (kinda over exaggerating of course) but literally, half catching a cold because he went to buy milk tea under the rain, caught a fever at bridon arc, and even though he sure does it to drag attention from others, he still coughs a lot On top of that, he's known for also liking to sleep (bc he's exhausted or smth?) I didn't see this over other characters, at least from not what I watched but I might have missed a few episodes from the chibi series Does anyone have an explanation for this, or do yall think it's js hazard? Or perhaps it's due to time travelling? Thanks everyone!