My favourite toner so far is Cosrx AHA/BHA Vit C daily toner. It works great on my skin.

Cosrx Toner

Somehow skin feels a bit sticky after applying this but except this nothing bad I feel about this product.

Contains a complex that helps brighten your skin tone, including 4% of niacinamide. - A fast absorbing water-type ampoule gently melts the Madecassoside beads onto the skin softly and absorbs them into the skin without feeling slippery.Fragrance free,Light-weight ,non-greasy formula,Soothing +brightening effect,Hydrating properties.