D.O. and Han So Hee continued to show off their friendship.

On February 10, a photo of a coffee truck D.O. sent to actress Han So Hee spread online. The truck was sent to the set of the upcoming film 'Project Y,' which stars Han Soo Hee, Jeon Jong Seo, Kim Sung Cheol, and Kim Shin Rok.

The photo showed the coffee truck displaying a photo of Han So Hee with the message, "Project Y x Han So Hee. Have warm drinks for energy. Showing support for 'Project Y.' Sincerely Do Kyung Soo (D.O.)."

Earlier this year, Han So Hee also sent coffee and fish-shaped pastry bread (Bungeoppang) trucks to the film set of D.O.'s upcoming drama 'The Manipulated.'

Meanwhile, 'Project Y' is a crime thriller film following the story of two friends who plot to steal 8 billion KRW (~5.5 million USD) worth of gold. Han So Hee has been cast to play the role of Mi Seon while Jeon Jong Seo will play her best friend Do Kyung. 

D.O.'s drama follows the story of Tae Joong (played by Ji Chang Wook), whose life is thrown into turmoil after he was wrongfully accused of a heinous crime. Tae Joong finds out that all this was completely manipulated by a villain who "sculpts" such hellish turmoil into people's lives. 

SEE ALSO: Doh Kyung Soo releases “FOREVER” for the soundtrack of ‘Resident Playbook’