"Un x100to" is a collaboration between Grupo Frontera and Bad Bunny. The song tells the story of a person who is deeply regretful and still in love with their ex-partner. The lyrics express feelings of sadness, longing, and a desire to apologize for their actions. The title "Un x100to" can be translated to "One percent" in English, which refers to the limited amount of battery or energy the person has left to communicate their feelings. They emphasize that they will use that last bit of energy to apologize for their mistakes and express how sorry they are. The person admits that if others see them with someone else in a club, it is just a waste of time because they are still not over their ex. The lyrics portray the person's attempts to move on by going out with someone else and trying to forget their ex, but they can't help but compare and miss their ex-partner. The person reveals that they still have saved photos and videos of their ex and often look at them, as it is the only thing that brings them some comfort. The person also confesses that when they go to sleep, they turn to substances like alcohol to help them cope with the pain and loneliness, envisioning their ex being there with them. The song highlights the emotional struggle the person is going through after the breakup. They acknowledge that their ex has moved on and is doing well, while they are still haunted by memories and unresolved feelings. The person admits that it's been challenging for them but believes that maybe leaving their ex was for the best. However, seeing their ex's happy and improved life hurts them. Overall, "Un x100to" is a heartfelt and emotional song that explores the lingering emotions, regrets, and longing experienced after a breakup.