No Age Is Too Old for Rebellious Spirit

After divorcing, middle-aged Su Mu accidentally activates the 'Youthful Rebellious System', gradually returning his body to age 18. He helps his son overcome emotional misunderstandings and assists his daughter in resolving her inner conflicts, repairing their parent-child relationship through unconventional methods. Facing obstruction from his ex-wife's clique of friends, he wins widespread support through his wisdom and charm. Ultimately, Su Mu rediscover himself and realizes the true meaning of life: living authentically is far more important than living up to others' expectations.