The first story is in the modern days. The MC is at a loan shark agency getting beaten up when an hitman comes and kill the loan sharks. He succed in avoiding death and killing the hitman. Then he start working as an hitman using his bare hands with the nickname "invincible" (or something similar)
The second story had quite a bit of success: It's in a fantasy china (or similar) and martial artists fight against demons. The MC is a boy with the pure yang body and his sister has the pure yin body. Because of that, they attracted demons and they were sent as sacrifices. They are rescued by a martial artist who will become their master/teacher. Rapidly enough the MC makes a pact with a sort of god from hell. He will receive from it a seed from hell that awaken his potential. He will also trade his lifespans on multiple occasions to stop times when fighting against demons. We also learn that nobody rules over hell and because of that, demons are coming to earth. What was interesting was that it was quite realistic in the sense that good guys don't always win, and there was a lot of death.
The second story had quite a bit of success: It's in a fantasy china (or similar) and martial artists fight against demons. The MC is a boy with the pure yang body and his sister has the pure yin body. Because of that, they attracted demons and they were sent as sacrifices. They are rescued by a martial artist who will become their master/teacher. Rapidly enough the MC makes a pact with a sort of god from hell. He will receive from it a seed from hell that awaken his potential. He will also trade his lifespans on multiple occasions to stop times when fighting against demons. We also learn that nobody rules over hell and because of that, demons are coming to earth. What was interesting was that it was quite realistic in the sense that good guys don't always win, and there was a lot of death.