In the starry universe, Minjun, a stranger from a distant planet, chose to stay on Earth and stay with Songyi.Although his decision was full of helplessness, it was also full of persistence in love.Song Yi, an ordinary but extraordinary woman, was moved by Min Jun's deep feelings, and the two hearts were tightly connected in the vastness of the universe.

However, Minjun's choice is not without cost.He told Song Yi that there was no danger in staying, but the opposite might be true.He may have to sacrifice his life to protect the earthly woman he loves so much.Minjun keeps this secret deep in his heart and bears the weight of his life alone.

At the same time, the brotherly dispute between Hui Jing and Zai Jing is also surging.Zai Jing, a seemingly prosperous business tycoon, was investigated by the procuratorate for allegedly confining his ex-wife Liang Minzhu for seven years.He remained calm in the face of the accusations and insisted that he was innocent.As for Hui Jing, he was deeply disappointed with the brother he once respected. He decided to reveal Jae Kyung's true face and avenge his dead brother.

In this complicated world, Minjun and Songyi found their own peace.They came to the vacation house together and enjoyed a short sweet time.Song Yi's frankness is in sharp contrast to Min Jun's helplessness, and their feelings become deeper and deeper in their mutual dependence.However, Minjun's superpowers gradually fail, which makes Songyi start to worry about his health.

Back home, Minjun and Songyi's relationship was recognized by Songyi's family.Although Minjun is not ready to marry Songyi, he is willing to take on all responsibilities and protect the woman he loves deeply.The appearance of Ying Mu added some twists and turns to this relationship, but in the end, with Min Jun's insistence, Song Yi's family chose to accept him.

However, just when everything seemed to be going well, Hwi-kyung discovered evidence that Jae-kyung had killed his eldest brother.The discovery of this voice recorder made Hui Jing more determined to fight against Zai Jing.At the same time, Minjun also faces a life and death decision.He knew that his time on earth was running out, but he still chose to stay with Song Yi until the last moment.

In the agreement at Nanshan Tower, Minjun and Songyi made an eternal vow.However, Minjun's departure made this vow even more precious.Song Yi found Min Jun's secret in his diary, and she shed tears of heartache.She understood that Minjun paid the price with his life for her.This love moved her and made her blame herself.

In the end, Minjun left this world in Songyi's arms.His departure made Song Yi extremely painful, but she knew that their love would always be engraved in her heart.In the vastness of the universe, the story of Minjun and Songyi will be told forever and become an eternal interstellar love.