Surviving by Becoming an Undying Hunter

His life was fine before. When the world changes when a strange portal appears that releases terrifying monsters, his life is fine. But, when Jihoon entered a suspicious Dungeon, he was trapped. Find the Hidden Dungeon and face off against the Lord of Darkness Byrhemmoth; the strongest monster in the Dungeon. Fortunately, he survived. But not with friends who have always been by his side. Makes Jihoon obsessed with the revenge. "The weak will forever be weak. What are you fighting for if you sacrifice everything as a result?" The Constellation of Parade was not known which side he was constantly instigating against taking revenge. "Your bravery makes me tremble and I also appreciate your hard work even though the result is the same. How about we negotiate?" Unexpectedly, the Constellation of Wisdom came extending her hand to Jihoon. There’s no such thing as a fine life. Jihoon threw it all away after seeing his friends, parents, and his crush die horribly. Take revenge on the Lord of Darkness, then plan to kill himself. But, is there any well-thought-out plan going so well? "I appreciate your hard work, that way you can get an Exclusive Skill from me through a Special Quest. Take this Skill and I will become a sponsor for you." [You have received Skill Undying Hunter Lv. Unknown from Constellation of Eternity] And the Constellation of Eternity is so obsessed with Jihoon to stay alive when Jihoon feels tired to continue to survive.