Upon its release, "Smile" debuted at number 48 on the Australian ARIA Singles Chart, number 55 on the South Korea Gaon International Download Chart and number 63 on the South Korea Gaon International Digital Chart. The accompanying music video features Im performing random acts of kindness as she gives out flowers, balloons, free coffee and drinks to people in the streets of Sydney, and visits a nursing home and childcare centre. Fans noted that the video's concept was similar to country duo O'Shea's video for their song "Bad Day Good" (2014). Im promoted "Smile" with interviews and performances on radio and television programs, as well as instore appearances.
