Man time travels from the past to the future, meets and falls in love with a woman. They then have to figure out how to untangle the mysteries/dangerous events of the past and send him back to where he belongs.

Historical setting. Supporting male character is murdered. The main couple's relationship and devotion to each other reminded me of the other couple in that the man has become a hardened warrior who no longer cares if he lives or dies and the woman gives him a will to live and change. Both are heartbreaking, beautiful dramas with slightly bittersweet but overall happy endings.

A trio of unrelated young people, each with emotional wounds, become a family and help each other heal. The story deals with themes of abuse, parental death, and a love story between two of the three.

Episodes 9-10 feature a love story between an angel and a human which is very similar in plot and tone. He has a mission which involves helping her but he ends up falling in love with her.

God-like being attempts to break his curse with the aid of a human woman but ends up falling in love with her and wanting to stay alive/on earth.
Beautiful soundtracks and visually attractive drama.
Romance and bromance.
Bittersweet ending.

A cat in human form becomes a pet then a romantic interest to a human.
The tone is light with both funny and heartwarming moments.

Both focus on assassins, with a bond/romance between two of them, and have open endings. However Assassin Academy is much shorter and lighter.

Human in love with personification of death or destruction, hospital setting, melancholy feeling, focus on plants/growing things.