Description

Based on the search results, there isn’t a widely recognized brand literally named “Odd and Even” skin type vitamin C serum. However, the results strongly suggest you are looking for a Vitamin C Serum that balances and treats uneven skin tones, dark spots, and pigmentation for all skin types (including combo/oily/dry), often marketed for “even skin tone.” 
Here is the description of popular 30ml Vitamin C Serums that fit this criteria:

1. Garnier Bright Complete 30x Vitamin C Booster Serum (30 ml) 
Description: A potent, antioxidant-rich serum designed to combat dullness, dark spots, and pigmentation, promising a radiant, glowing complexion.
Key Ingredients: Enriched with 30x Vitamin C and Yuzu Lemon Extract.
Benefits: Reduces dark spots and acne marks in just 3 days, brightens skin from the first application, and provides intense nourishment.
Texture: Lightweight, non-oily, and non-sticky formula that absorbs quickly.
Suitability: Suitable for all skin types (Dry, Oily, Sensitive, Combo). 

2. Plum 15% Vitamin C Serum with Mandarin (30 ml) 
Description: A highly stable, vegan, and fragrance-free serum that enhances skin glow, reduces dark spots by 30%, and treats hyperpigmentation.
Key Ingredients: 15% Ethyl Ascorbic Acid (Vitamin C), Japanese Mandarin, and Kakadu Plum.
Benefits: Boosts collagen, improves texture, and gives a radiant, smooth, and plump skin.
Suitability: Suitable for all skin types, including sensitive skin. 

3. Foxtale 15% Vitamin C Brightening Serum (30 ml) 
Description: A potent formula designed to visibly reduce dark spots, fade pigmentation, and restore an even, radiant complexion.
Key Ingredients: 15% L-Ascorbic Acid (Pure Vitamin C) and 1% Vitamin E.
Benefits: Combats free radical damage, moisturizes, and promotes a youthful glow.
Suitability: Suitable for all skin types. 

4. Chemist At Play 10% Vitamin C Face Serum (30 ml) 
Description: A non-greasy, daily-use serum that utilizes stable Vitamin C to brighten skin and reduce dark spots.
Key Ingredients: Ethyl Ascorbic Acid (Vitamin C) and Vitamin E.
Benefits: Promotes an even skin tone, improves texture, and leaves skin soft and refreshed.
Suitability: All skin types.