Imagine your boyfriend for a decade disappeared without a trace and left you mourning for 5 years. Then some person guilt tripped and manipulated you into relationship by making you think that you raped them but actually you were the one who's been raped (Taejoo was blackout drunk). So even though your soulmate returned, you felt you didn't deserved them anymore so you let them go and just focused on your new lover because you're a good person and you felt responsible. I'm really just glad the author let us see that Taejoo moved on and became happy.
Imagine your boyfriend for a decade disappeared without a trace and left you mourning for 5 years. Then some person guilt tripped and manipulated you into relationship by making you think that you raped them but actually you were the one who's been raped (Taejoo was blackout drunk). So even though your soulmate returned, you felt you didn't deserved them anymore so you let them go and just focused on your new lover because you're a good person and you felt responsible. I'm really just glad the author let us see that Taejoo moved on and became happy.