I feel really bad for everyone in this chapter, but perhaps Taehoon the most. Being eclypsed this early in life is about as painful as it gets.
Ironically, the answer Taehoon needs is in Moonsung. He could make up for being less talented than Dowoon by working hard like Moonsung.
Sadly, child prodigies sometimes have a hard time learning to work hard. They're simply not used to not getting things their way effortlessly.