Hyorin and her amazing vocals have done it again! The SISTAR member's song "Hello/Goodbye" for the 'You Who Came from the Stars' OST is already topping charts afters its release on January 22. 

SEE ALSO: SISTAR's Hyorin sings for hit drama 'You Who Came From the Stars' OST with 'Hello/Goodbye'

Immediately after it hit stores, "Hello/Goodbye" made an all-kill on the major real-time music charts. The song, an uptempo pop ballad with a simple melody written by hit OST producer Choi Jae Woo, was first revealed during Kim Soo Hyun and Jun Ji Hyun's kiss scene. 

Congrats to Hyorin!