"I Do" () is a song recorded by South Korean singer-actor, D.O. that was released on September 8, 2023, by SM Entertainment and distributed by Kakao Entertainment as the pre-release single for D.O.'s second EP, Expectation.
D.O. debuted as a soloist through debut EP Empathy on July 26, 2021, with lead single "Rose".
In 2022, D.O primarily focused on television roles. In May, he appeared in Off the Grid, an unscripted travel documentary series. In October, he starred in legal drama television series, Bad Prosecutor and sang one of the series' soundtrack, "Bite".
On September 1, 2023, SM announced that D.O. will have a comeback on September 18, the first comeback in two years and two months after his debut EP. The comeback schedule poster was released on September 4 and "I Do" was announced as the pre-release single scheduled to be released on September 8.
The song and its music video were released on September 8, with the latter described as the continuation for the music video of "That's Okay" which was released in 2019.
"I Do" is an acoustic pop song with a rhythmic melody produced by Ryan S. Jhun and Kristoffer Tømmerbakke. The lyrics are penned by Song U, narrating the desire of being close to the loved ones while enjoying meteor shower.
The song was co-composed by Jhun, Tømmerbakke, Peder Elias, Jeon Myung-hoon, and Park Min-soo, and arranged by the former two.
The music video was released on September 8 on SM's YouTube channel. Described as the continuation of "That's Okay" music video, the video shows an animated couple enjoying their time together as the day progressed.
"I Do" peaked domestically on the Circle Chart at number 25. Overseas, it peaked at number 11 in the World Digital Song Sales chart.
"I Do" is included in the set list for D.O.'s first Asia fan meeting concert, "Bloom" in 2024.
Credits adapted from the EP's liner notes.
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