One Day, I Became a Hatchling

After 999 years of painful endurance, Imugi can't wait to finally become a dragon. But after his death with just one year until ascension, he wakes up to find himself reborn as a hatchling with stubby little legs and a squishable cheek to boot! Having never known kindness, he sets out into a world filled with magic and dragons, and with the love and help from those around him, gradually opens the door to his heart. To become a dragon, he will have to take baby steps... and make friends along the way. Source: Webtoon