SPOILERS

Dam and mishi would be locked up and they will beat up mishi until dam can't take it anymore and touched the dad and he turns to ashes while the others will get dam and mishi. Dam created a massive bridge made out of plants so they can cross the border that made him hibernate for years coz yullie grew up already they're at the underground sanctuary with a thriving population and when dam approached mishi he ignored him. Mishi was apart of the group who would go outside to explore because the environment above the ground was toxic so there's a time when food was inefficient and dam grew the fruits and vegetables that they have on a room. Him and mishi got a reconciliation and there was a flashback when they were escaping where florian was shot and dam was in hibernation mode they were found by the people and they were only focusing on florian who was shot while mishi was the only one left with dam's unconscious body that he realized his left all alone that made him grew apart from everyone even dam. Lastly dam went outside and restored the plantless land back into an abundant environment with grass, trees and flowers. Then dam was nowhere to be found it was like he became one with the nature. Timeskip to the future where mishi was old he'd turn into a some traveler and he visits back again to where dam was and they had a brief lovely meeting and he leaves again. It was a comforting separation where in mishi was at peace with his love for dam for he was the only family he knows right from the start and now he accepts that they will continue living on without being together anymore, but in memory of each other as always . It was melancholically beautiful.