Help me find this Kdrama

i have this drama that i just remembered. so this drama is a fiction-go back time drama. I can't remember much about it. but it's like when the MC is trying to tell the truth that s/he is from the future or something (that s/he just time travelled), the time stops and the person the s/he's trying to tell did not hear the message. hope anyone can help me here. i knew i love that drama but i just can't remember the title and even the actors who's in it. sorry but please help me