The talented duo of Davichi recently participated in the OST for SBS's "Smile, Mother", by singing the drama's main title track, "One Person." Member Kang Min Kyung plays the leading role in the drama as 'Shin Dalrae', a young woman who dreams of becoming an actress.�The plot centers around the happiness she and her mother find as they work to understand each other and overcome obstacles. "One Person" was composed by Shin In Su and written by Jo Eun Hee, and features a sad piano melody with a modern string addition.�Check it out below! Source: Daily News via Nate