Grin Affair is a dessert cafe selling gelato and waffles in a quiet HDB residential estate in Singapore. It serves crisp waffles with balholo, dark chocolate, roasted coffee, and sea salt hojicha ice cream, and mixes sea salt lemonade with espresso. The cafe stays open until midnight, has limited indoor seating, and shares outdoor seating and a residential car park. Gelato flavors include Mao Shan Wang, hojicha latte, and Earl Grey.