"TW-LOG with Secret Friend" (Separate from the Time to Twice series) is a series where each member of TWICE has to create a short vlog for their fans all the while buying or making a present for a certain member. At the end of the series, they give away their gifts to their "secret" member, which is revealed in the final episode.
Fans have to guess which member makes/buys a gift for as the series progresses, based on evidence from the members, as, until the final episode, only the member making the gift knows who they're giving it to.
The TWICE members also have to complete challenges for the "secret friend."
I.e. Sana has to give a kiss to _____
If the member fails their challenge, they have to post a short dance video to their next comeback (in this case, Alcohol-Free)
A video was released every Tuesday, starting with member Jeongyeon.
Members Nayeon, Jeongyeon, and Chaeyoung failed to complete their challenge which resulted in them in having to post a short dance video of them dancing to their latest comeback, "Alcohol-Free"