i rarely watch historical / xianxia cdrama because the ending mostly tragic and sad, but i really love Ten Miles of Peach Blossoms, Perfect Couple and General and I. those dramas has happy ending so don't need to worried when you start watching that.
but i can recommend some modern drama like
Memory Lost
Love Weaves Through a Millennium (time-slip themed drama)
Shuttle Love Millenium (sequel of Love Weaves Through a Millenium with different casts and story)
Loving Never Forgetting.
also Because Of You / Because Of Meeting You.