Tear Jerker / Nirvana in Fire

• Nihuang begins to suspect Mei Changsu's real identity. So she compares a letter he wrote to a letter Lin Shu wrote. She's clearly saddened to see the handwriting is different.
• Nihuang confronts Mei Changsu and tells him she knows he's Lin Shu. She begs him to never leave her again. Mei Changsu sadly tells her that they can't go back to the way they were before, and she must keep his identity a secret.
• Jingrui's breakdown after learning of his true identity. The shock must've been too much for him to bear all at once on his birthday of all days!
• That scene in Episode 53.

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