유난히 오늘 따라 왜 그렇게 웃고있는거니? : why are you so smiling(at me) a lot today? 얼마 전 내게 ᅡ소개 시켜준? : i guess this sentence could be "얼마전 내게 소개시켜준 (그사람/그남자/그여자 etc..) if that, it means "(the guy/the lady/the person) you set me up with a couple of days ago. "소개시켜주다" will be translated into Korean with two different meanings and it depends on context. when it's regarding "a date" between a guy and a lady, it could be translated into "set somebody up with somebody" like a blind date, also it could be "introduce somebody (to somebody)" make them get to know each other.

Why are you so specially smile today? You introduced me some days ago? <--- uncompleted korean sentence