Biệt dược đen

The story of friendship revolves around a group of children in Mây Village, where Tú, a lively, mischievous girl who loves fairness, always wants to protect the territory and inhabitants of the 'headquarters' she established. Nearly 20 years later, Tú is busy working as an operations director at a company founded by her older brother, Viễn, and their old friends. And by chance, when the group returns to Mây Village, the secrets of the past are revealed, awakening memories that were thought to be buried forever.