"'Cold city boy' investigator? 'Warm city boy' investigator!" A collection of actor So Ji Sub's '20 Flower Smiles' has been revealed.

The collage of So Ji Sub reflects his brightly smiling image while filming SBS's Wednesday-Thursday drama 'Ghost.' So Ji Sub, who is known for his strong and reticent chic image on screen, surprises audiences with his playful and euphoric image in these photos.

So Ji Sub is currently acting as main server Kim Woo Hyun (Park Ki Young) of the police's cyber crime unit in SBS's 'Ghost.' He is capturing audiences with his realistic harsh and sophisticated 'cold city boy' investigator charm in every episode.

In particular, So Ji Sub immerses himself as filming begins and holds up his chic image up until the OK sign, and after, immediately brings a joyful atmosphere to the filming site with his smile. One staff member commented, "Thanks to So Ji Sub's easiness, laughter, and jokes, the filming site is always pleasant."

So Ji Sub's various smiling expressions of naivety, pureness, sweetness, gentleness, warmness, brightness, loveliness and softness grab the hearts of female audiences.

Netizens reacted to So Ji Sub's 'flower smile,' "I want to fall into that smile. Whatever expression, whatever he does, everything becomes a photoshoot. If only I saw that smile in real life...where can I go to see that smile?"