The male lead is called Lu something Yan.

When the female protagonist was in a book, there was a system. After the male protagonist got into an accident, he also had a system. The system gave the male protagonist missions every day. For example, the female protagonist had to give the male protagonist a hug and say,"I love you." The male protagonist completed the mission and obtained time to live. In the end, the female protagonist found out that the male protagonist liked her because of the system and was very sad. Later, she forgave the male protagonist. The ending was that the system gave the male protagonist a mission to buy flowers, but the female protagonist got into an accident. The male protagonist gave up the mission to save the female protagonist. Because the male protagonist had given up on the mission, the male protagonist had no time. The female protagonist asked the system how to save the male protagonist. The system allowed the male protagonist and the female protagonist to share their lives. The female protagonist lived for 80 years, and the male protagonist could live for 80 years. The male protagonist and the female protagonist were together. Please give me the name of this novel, thank you!