System type manhwa (gates, dungeons, world hopping and shits)

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded "By the time you hear this, I guess I will be already dead."

I was the greatest hero on Earth. “But he’s dead. How could the guy we’ve killed come back?” “I dunno. But if he can come back, just let him.” I really came back after 20 years? “Why’re you so surprised? What? Did you do something to hurt your consci

In the mobile gacha game infamous for its atrocious difficulty, ,the Master ranked 5th in the world, 'Loki', loses consciousness while raiding the Dungeon.'What? I'm a game character now?'After waking up, 'Loki' realizes he has turned into a Level 1,