Future Call

Jian Mo has never been able to move on from her younger sister's death four years ago. When she was finally moving out of their place, Jian Mo finds a strange smartphone among her sister's belongings and was surprised to hear her younger self from four years ago picking up the phone.
When Jian Mo
dialed her own number and got through to her younger self on the day her sister died four years ago, she persuades "Jian Mo" to find a way to help their sister evade death. Alas, it seems Jian Ran
is destined to meet the same end no matter what they try from getting into car accidents, falling from a building to being assassinated... At the same time, the phone that has allowed Jian Mo to connect with the past is running out of power, and the hands pulling the strings are also quietly moving...
(Source: ChineseDrama.info)