We didn't need the confirmation that Taegu has romantic feelings for MC. It was better off being hinted at. It's turning into a Harem at this point, seriously 3 dudes are into MC? What are the chances
Author has drawn him wearing the same watch before when he's suited up. He had a meeting with his dad so ofc he's going to dress the part. He only dresses down when with FL, which also explains the unfamiliar scent. Clearly his dad's impromptu visit rattled him so he's trying to act like a prodigal son, he knows it's a matter of time before dad figures out who he's dating which wont be good look (older woman, lower social class). I bet his dad would try to set him up some chaebol heiress or something, so he probably doing his bit to lock in the successorship before this so that he can freely date FL
He is clearly a yearner at heart, just sadly has a mental block which is the fear of rejection that causes him not to admit his true feelings.