Cake by the ocean

I am looking for mangwa ......
Start with school by killing every one that come to site and than suddenly time reverse......
Leter he try to finds that who is doing this cause he was also using some kind of powe at that time ...and find one boy how turns time bake when ever he sees him killing any one ( not bl) please can any one tell me about it

Resently i cant find new story that much fun because.....
BL. - all of them toxic , phycho, and torture
Straight - in historical and modern - husband cheating, friends cheating,family betrayal,coming in novel and thinks no one likes her ( this types are frustrating literally shows tha everyone like them and are crazy for her but she judge othem base novel and thinks they don't like her )
Main hero how is supposed to love the OGFL start liking the FL like come on maintain something comen sences ......
No New Concept at all only this things are going on serious no new concept for manhwa manga any thing .....
If any one has any suggestions other than above concern then please give me the name