Taejo is a good person we can all admit that, also him moving on is also very normal. BUT the way he treaded yoon after he came back is something can’t be forgiven and mean .he slapped him in the head when he finally woke up from damn 5 years coma?!!! Push him in harshly way without considering that yoon in his weakest state! so I guess he deserve to feel a little bit of regret for ruining his old relationship with yoon..
Why everything is so complicated?
Because people forget to communicate