Responses

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basically mc's memory is false: the message from the dungeon is that there are two options—either those who posses gaia skills enter and try to clear it (no time limit) but if they fail, the dungeon explodes and so all the monster get out into the real world, or they choose to destroy the dungeon but it reappears in 10 years. kangjin basically has a skill that can alter memories (this was his second time using it, so here's a hint of another memory being false), so the mc doesn't remember that he stayed behind. as the dungeon got destroyed, so did kangjin ☹☹☹
Okay I really need to know what happened to Lee Kangjin. Is he still alived probably? Damn he was such a good leader but it will be pretty disappointed if he turns to be a villain ╥﹏╥