Which ancient poet wrote love poems to his cousin?

Lu You and Tang Wan are cousins and used to be husband and wife. However, Lu You's mother felt that their husband and wife were too kind and unloved, for fear of affecting Lu You's future, so she hit Yuanyang and forced Lu You to divorce his wife, which became Lu You's lifelong regret. Although Tang Wan later married a very good man, when they met in Suzhou, it aroused Tang Wan's sadness. Soon, Tang Wan died, leaving a lifelong pain for Lu You.

Liu You and Tang Wan looked at each other four times. How many years of pent-up emotions welled up in my mind, and I started writing on the wall:

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Red crisp hands, yellow wine. Willow trees on the palace wall in spring in the city. The east wind is evil, and the feelings are thin. A cup of sorrow, I haven't seen you for years. No, no, no.

Spring is as old as ever, and people are empty and thin. Tears flooded her face. Peach blossom falls, idle pool pavilion. Although Meng Shan is here, it is hard to trust Jin Shu. Momomo.

Then he sighed deeply and turned away. Tang Wan was left alone, facing the wet ink on the wall, with tears in his eyes.

A few days later, Lu You received a letter from Tang Wan, which contained only one sentence:

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The world is thin and human feelings are evil. Rain makes flowers fall easily at dusk. The breeze is dry and the tears are residual. If you have to worry, just say it alone. Difficult, difficult, difficult.

People become different. Today is not yesterday. A sick soul is often like a thousand ropes. The horn sounded cold and the night was hazy. Afraid of being asked questions, swallow your tears and pretend to be happy. Hide, hide, hide.

This is the Hairpin Phoenix by Tang Wan and Lu You.

Soon, Tang Wan died of depression.