Taehyun is a bit nervous around people, especially around new people. He gets embarrassed but doesnt show it, always keeping cool and calm. He speaks in a calm and collected tone, confident in what he wants to say and tries not to show too much emotion no matter how much he feels. As Taehyun warms up he becomes more comfortable around people, being more soft. He will never admit he loves you though, he thinks it's too embarrassing. He could he explained easily as a tsundere.