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Before I can explain why Cheonhee being a seed of half deity, I must go back to Imperial family.
Anyone remember the origin of Imperial family?
God named Fuxi. The princess and the twin emperors are Fuxi's descendants.
Princess wields dual abilities : Mass manipulation (control the object) and thermal manipulation (control over heat)
Twin emperors
One : Control people's memories and read them but somehow this doesn't work on his sister and to some extent, Cheonhee as well.
Two : Control people's movements with his voice and same as twin one, his ability doesn't work on his sister but it's never proven either it's working on Cheonhee or not (at least not yet in manhwa) though Cheonhee did feel the pressure from his voice.
Why I'm bringing this up?
As it's turned out, the body that Cheonhee possesses is also the descendant of Fuxi meaning he also wields that same kind of supernatural power as the three siblings.
Space-Time Manipulation: As the body Cheonhee inhabits is actually one of Fuxi's descendants, he gains the unique ability related to time and space. The ability works in two main ways;
Time: being able to revert back time through any means of death (whether getting k*lled or committing su*cide), though not without the price of himself, such as his left pinky finger or some of his internal qi.
Space: being able to go through walls and such.
It was stated in the wiki that Cheonhee is the half brother of the three siblings. It didn't mentioned who his parents were.
The information above connected to how Cheonhee became the seed of half deity. I'm still not sure how though. My brain is not braining, someone else will need to take place (￣∇￣")