Mainland China artiste Crystal Liu Yifei and Korean star Song Seung Heon developed real feelings for each other after acting in The Third Way of Love movie.
According to Asian E-News Portal, they attended the promotion campaign for variety show, Day Day Up together for the first time and played games together.
The sharp-eyed netizen noticed that Crystal's face immediately "turned black" after the organisation team arranged a female fan to hug Seung Heon from behind.
The netizen laughed and said: "The female goddess is jealous and how cute she is. Song Seung Heon, be careful!"
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According to a My Paper report, Song is full of praise for his girlfriend, and has even expressed hopes that the relationship will continue to blossom.
See also: Chinese-Korean celebrity couples in the spotlight
He affectionately praised Liu for being "more mature" than him in many areas, despite their 9-year age gap. Song is 38 while Liu is 27.