Taku caught feelings at some point but his first intentions weren't the best and big part of the relationship (before they were officially a couple) between him and Haesoo was a play. Even to the very end his feelings were selfish and he admitted to it himself.
Spoilers
He wished Haesoo a hard times, regret and more and less unhappiness in his relationship with Joowon meanwhile for example Joowon wished Haesoo happiness and promised he can always count on him even if they weren't together.
End of spoilers
Haesoo's and Jooown's relationship had unhealthy traits but it was also impacted but much more complicated situation (their family one) which twisted their relationship from the very beggining.
if you still think taku is the best choice for heasoo after this chapter ....