Singer Sun attended an official event's photo wall and struck a heart-shaped pose for the press. Unlike usual, Sun drew the attention of those present by completing the heart with a somewhat awkward expression and movement.
Understanding the 'Ball Heart' Pose
The 'Ball Heart' is a popular finger gesture in Korean pop culture used to express affection. It involves forming a heart shape with the fingers against one's cheek, a common pose for celebrities during public appearances.
About Sun
The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light, ultraviolet light, and infrared radiation.
Wikipedia