"Mileage" (마일리지; Mailliji) is a song by South Korean musicians Jung Yong-hwa of CNBLUE and Yang Dong-geun (YDG).

While filming the television series The Three Musketeers (2014), Jung was inspired by YDG's affection towards his family on set to compose the song.

[2] As recording for the series took place, Yang conveyed endearment to his family on set; Jung took this as inspiration to write the melody for "Mileage".

[5] One day prior to its release, a music video teaser for "Mileage" was revealed;[9] the full version was uploaded on January 9.

Both reviewers noted similarities to Jason Mraz's music, with An particularly highlighting the "groovy" and "simple" instrumentation, which made him feel that it could "pass" as a CNBLUE track.