Spoiler text.he is trustworthy but kinda crazy too, he'll kidnap moondae and will threaten him or try to kill him, cause something happened in his group and he need to go back in time like he usually does. however, he can't cause it's like the power has already stopped (can't explain it accurately) and if he die, he won't go back anymore, so he kinda need moondae to die to reset everything again, but you know moondae doesn't have the same skill as him