Inthira Charoenpura, nicknamed Sine or Sai, is an actor and singer. She's the child of famous actor and film director Ruj Ronapop and the half-sister of actor "Kung" Vipavee Charoenpura and singer Mai Charoenpura. She received a bachelor's degree from the School of Communication Arts at Bangkok University.
Sine is extremely well known for her role as Mae Nak in the 1999 Thai horror film "Nang Nak".
At the age of thirteen, Sine signed a record contract with GMM Grammy and released the pop album Nalika Sine in 1995. In 1998, free from her contract with GMM Grammy, she released an indie rock album titled Sine. With the success of that album, she rejoined Grammy and produced the rock album D^Sine in 1999.
In recent years, Sine has become known for her activism, outspoken about human rights and mental health.