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1TEAM's first own reality show (Season 1).

LOVELYZ DIARY is a special project of the Korean girl group Lovelyz, where the girls show the hard work of five years they put into their upcoming debut.

The cast members take various trips throughout South Korea, including many offshore islands, recommending various places that viewers can visit. While doing so, members also perform missions at a certain mealtime or point of the day to earn rewards (eg. foods that are famous in the region they visit) and to avoid punishments

Members visit different parts of the world in-between promotions

Every week there will be a featured market from South Korea and within it, there are 3 types of food selected as its representatives. The cast and guest(s), as contestants, have to play games and win to be able to enjoy the food. There will be a dressing theme concept for the cast and guest(s) to follow for the filming of each episode. For episodes, 1–4, the program format is only 3 rounds of song dictation. From episode 5, the program format changed to 2 rounds of song dictation, with a Snack Time in between the dictation segments.

Acquaintances of a celebrity (friends, managers, parents, siblings, etc.) are invited to answer a quiz about the celebrity to see if they know him/her as well as they think they do. For instance, they will have to watch videos of the celebrity and predict his/her next actions.

For Season 2, a slightly different change is that 4 guests related to the celebrity are invited to the show and take on the Non-related Observers (the cast members except Jang Sung-kyu) in a quiz about the celebrity. A total of ₩3,000,000 is up for grabs and the team with more winning money wins the quiz.