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It was a manhwa, probably shonen ai since they were all children?
Mc dies and wakes up as a young prince (dark hair), the scene he wakes up in :his mother hugs him while scolding his half brother (blonde) because mc fell off a horse. He defuses the situation and the other prince gets away with a slap.

General details I remember:
—They are like 6-10 y/o
—The half brother is only 6 months older or smth like that
—Some friend character with glasses notices his strange behaviour
—Mc og character has some kind of inferiority complex
—It is probably some kind of game/book mc woke up in