The Celestial Returned From Hell

Hunter Choi Yeonseung decided to start special training to stop the constellations that want to monopolize Earth. His training location was the Abyss, a space where time flowed infinitely slowly. However, Choi Yeonseung was suddenly caught up in a magical storm and had to face the harsh Abyss head-on. Choi Yeonseung went through unprecedented and infinite practical training throughout the Abyss and discovered a clue to be the first human to become a constellation. The hard-working hunter, Choi Yeonseung, was reborn safely as a constellation. Will he be able to save Earth, which is destined to fall prey to the constellations? The hard-working, overpowered martial artist, Choi Yeonseung! The path he walks on to become the first human constellation! — Description from novelcodex.org