Help please!!!

If i remember correctly it is manhwa. The mc is weak since they thought that the mc hasn't been awakened. The mc had a traumatic childhood past that is one of the reason why his awakening is kinda late compare to the other child. Fast forward, the mc and his classmates the mc and his classmates were inside the building to conduct there training then suddenly a terrorist attack occurred, they killed students, then the mc is scared. He came face to face with the leader of the terrorist. So the mc ability has a connection with his alter ego. And he still can't control it, I think it has some sort of connection with blood, since his parents had been brutally killed by his auntie and uncle.

I wrote what i remembered