Jin Bo-ra (born January 12, 1987), known professionally as Sunday, is a South Korean singer and musical actress.

She debuted in 2004 as a soloist in Japan with the release of two digital singles before eventually joined as a member of South Korean girl group The Grace in 2005.

Sunday began her career as a soloist in Japan with her debut digital single, "リラの片想い" (Rira no Kataomoi), on July 10, 2004.

[2][3] The duo released soundtrack "Now You" (지금 그대) for the drama Hooray for Love (애정만만세) on September 23.

[6] On January 20, 2021, it was reported that Sunday's exclusive contract with the agency had come to an end in May of the previous year.