Li Yu

Li Yu is the father("4th Grandpa"?) of Han's best friend Li Qi. We are first introduced to this character in the first 50 chapters when Li Qi and Hua has a bite together, and Han notices that Li Qi was feeling uncomfortable as he was drinking quite a lot. Li Qi then goes on and tells Han that his grand father Li Yu has Esper disease, a type of disease where you get radiated by gamma rays or something, and it deteriorates the origin energy inside a person. Soon after Han went to Night Walker to ask questions and bought a potion extracted from a 4* Esper powers which could heal Li Yu. In return, Li Yu let Hua enter the excavation site that decided earth future in order to train.

Star rank-Four Stars

Origin-Earth

Ke Lake's(rank-five stars) master.

He is in military.

Saved by Han Lang when he was seriously injured