I Ended Up Training the Villain Too Well Too Early

Read manhwa I Ended Up Training the Villain Too Well Too Early / 흑막의 조기교육을 너무 잘해 버렸다

On their 10th birthday, a child regains memories of a past life and realizes their family is destined to be destroyed by a future villain. To prevent this, they decide to raise the neglected prince, the future villain, with care and guidance. However, their efforts work too well, leading to unintended consequences.