OHHHHHHHHHHHHH. This is wonderful. THE SWEETEST. All of it - Zhao Yunlan's nightmare and how affected he is by it, Shen Wei wanting to comfort him but unsure if his comfort is welcome (OF COURSE it is!!!!!), just. Everything. The way Zhao Yunlan needs Shen Wei (lets himself need him). The little bits of how Shen Wei uses his powers (for Zhao Yunlan). And the whole "can't promise not to leave, but will absolutely look back" thing in particular. Just, OMG my heart, it's perfect. I love it so much.