Guys I don’t understand is there any particular reason why the mL is so fucking harsh to...

It might be spoiler but...
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He wanted ryujin to kill him , shin never wanted to live forever he wanted to die by the hands of love of his life like a salvation but ryujin didn't do that he told shin to live forever till his hair grow grey regret his life decisions he did to ryujin, cuz death would be too easy for him ... And wanted ryujin to become like him but actually Ryujin is very strong mentally and shin is weak mentally

It does kinda make sense

Yeah his planned changed cuz of ryujin.

wait so they’re not endgame?

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.Of course they're end game , shin lives so as ryujin they moved to germany together left everything behind.

i heard shin becomes blind ?

Yes his eyes aren't that great partially blindnee due to eye damage he can see but can't shoot or drive...

Your description is wonderful , can you spoil the ending ? I know they will end together and travel but that feels so unfair like the ml did nothing and makes me even sadder , is there any regrets, revenge or even karma to the ml. ?

Hey , i have wrote whole story spoiler on top comments you can see I also wrote dialogues..