We eat Samgyetang on the hottest day of the year in summer.
문법 Grammar 1 : (으)ᄂ
-(으)ᄂ modifies a noun that comes after adjective. When the stem of an adjective ends in a vowel or its final consonant ᄅ, -ᄂ is used. When the stem of an adjective ends in a final consonant except for ᄅ, -은 is used. (※ 있- and 없- are followed by -는)