Meladuse Ampoule, won't it sting if I have sensitive skin?

Lately, my skin tone has become noticeably dull and I've started to develop dark spots around my eyes, which is concerning. While researching vitamin cosmetics, I came across reviews of the Meladuce Ampoule, which boasted mild ingredients but also had excellent whitening effects. I have very thin and sensitive skin, and I've experienced a burning sensation when using vitamin products in the past, so I'm concerned. I'm curious about how irritating the Meladuce Ampoule is and whether you've actually noticed any effects on blemishes.

Skin Concerns: Improves freckles, blemishes, and dull complexion

Product Features: Contains hypoallergenic pure vitamins and provides skin radiance.

Question: Is it necessary to use sunscreen during the day after using Meladuse Ampoule?

Expected effect: Skin tone improvement after using one bottle of Meladuse ampoule