The current Brother Will disappears because his brother is already dead on the past timeline, so that's why he want to find his body
i’m pretty sure he wants to find his body because if he doesn’t the current timeline brother will still die/disappear after a certain time passes because his past self isn’t there anymore
I’m not sure how far you’ve read into the novel but from what I’ve seen the story will address the messy conflict that occurs with the dead Yoohyun and alive Yoohyun, as well as Yoohyun and Yoojins feelings regarding it. I’m pretty sure there’s a whole arc for it but I haven’t gotten there yet
I still wondering why yoojin are so fixated on finding yoohyun dead body that was being kept by birds who count the stars (chirpy) it almost felt like he prefers his dead timeline brother than the current timeline brother.
I actually dropped the novel due the messy disconnected sequence , i feel like the author has so many ideas and sometimes it incorporated in a contradicting storyboard in someway haha. Anyways, i love the manhwa so imma jst enjoyed it without thinking too much into detail(≧∀≦)