What is the name of this webtoon?

hi guys! i’m looking for a webtoon i briefly read on the website instead of app so i lost the name of it

the plot involved a girl who was overweight, i think she was made fun of since she either tripped in public and/or was lifting weights and the buttons on her shirt popped out.

she later talked to the ml who was helping her lose weight but she ended up losing weight abnormally fast because of a magical app she signed up for, the person in the ads for the app was a blonde girl i think

any help finding this would be greatly appreciated! when i read it it wasn’t anywhere close to complete and its a translated to english from the korean webtoon