Knight in Rain

Knight in Rain summary:

A weird ” Blue Rain' , started falling on male lead [An Mu]'s city, resulting in many people to be unable to sleep well, after getting to know that a organization “Qing” will enter the dreams of people that have been unable to sleep well, and kill monsters, male lead [ An Mu ] decided to join the organization and kill those monsters to level up and become strong, his only motive – is to save his crush's dream