On August 11, Million Market released a live teaser video of IONE and Taewoon's collaboration single "VACCINE (Feat. Bomi)".

In the teaser video, Taewoon, IONE, and A Pink's Bomi were seen singing a portion of "VACCINE" live. Taewoon's trendy and bright rapping style created a unique atmosphere and from the beginning to the end of the teaser video, the medium tempo song filled the room with positive energy. With Taewoon's rap and IONE's honey-like voice harmonizing together, the catchy melody of "VACCINE" was previewed. Further, the witty lyrics that contradicted from the exciting atmosphere of the song drew interest. 

Taewoon and IONE have known each other for ten years, having spent their trainee years together before making their debut as singers. Both of them participated in composing and writing their upcoming collaboration single "VACCINE".

Meanwhile, "VACCINE (Feat. Bomi)" will be released through various online music sites on August 16th, at 6PM KST.