In her birthday mukbang, Donna joyfully indulges in various cakes, starting with a strawberry cake and moving on to red velvet and chocolate. She humorously struggles with the overwhelming sweetness, taking breaks to drink water and eat something salty. Despite feeling sick at times, she appreciates the cakes and celebrates reaching 4 million subscribers. In the end, she triumphantly finishes, thanking her viewers for their birthday wishes.