Akjak

Prince Lee Tae-Rok, who will never become a crown prince or a king, welcomes his nephew Lee Nan-Young when he is thirteen years old. A child with no talent for swordsmanship and an overly gentle personality. He was asked to take care of his nephew, whom no one expected, at his brother's request, and Tae-Rok initially thought of it as a responsibility. However, Nan-Young grew up looking only at Tae-Rok, and his desire to be like him gradually turned into an emotion that was difficult to explain. Tae-Rok noticed the change, pretended not to know, and kept the line. However, in the end, Nan-Young kissed another man to confirm his feelings, and Tae-Rok saw the scene and—

"My nephew will become a scandal to me. This uncle will also become a scandal to my nephew."

(Source: Bomtoon, translated)