The case of the baby potion have been spread around Korea and Japan. It makes the people shock and give confusion to everyone. As soon as Professor Furi work in an antidote. Another group became a victim once again. 

This time... Its not only 3 members who was victimized, its 4. The problem is, Professor Han have a new partner in crime and the worst thing is... He and that person planned something worser than what he did to Tzuyu. 

What if... The 01's line members of IZ*ONE Have become a baby and their time duration is only 30 days, will they find the person who did this and who Professor Han acquaintance is or... Will they fail and let the one of them meet her worst fate? 

This 30 days of being a baby Season 2 (IZ*ONE version)

P.S: I recommend you to read the first book which is the Twice version to understand the plot. Thank you!