emeraldarrows

Both are BL love stories with a melancholy and poignant tone in which the couple met years ago when one was still a child and the other who he viewed as a big brother tragically died which continues to haunt the now adult child. However due to supernatural circumstances the two meet again, now the same age, and fall in love. Both dramas have a bittersweet ending.

Both are shorter length dramas in which the ML has two very different personalities. At first his behavior confuses the FL until she learns his secret.

In both the ML has two personalities.
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In both dramas the ML has two personalities.
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In both dramas, one or both of the leads time travel within a limited period of time, trying to change events in the present/near future that they don't have the full picture of. The ML's personality changes from what it is initially (from cheerful to withdrawn/somber in MDD and from selfish to self-sacrificing in TWY), and both FLs are sunshine personalities who bring light to the ML's life. Both couples have very good chemistry.

Both involve a guy and a girl exchanging bodies and experiencing character growth as a result.
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Both dramas involve a guy and a girl getting into accidents and exchanging bodies, resulting in a deeper understanding of themselves/each other.

Both MLs are the villains of stories (manga vs. novel) written by the FL who enter the real world. Both dramas have a similar fluffy romance tone.

Both dramas are a combination of the mystery, fantasy, and romance genres and involve a serial killer/kidnapper and the leads having a shared past experience together. Both couples end up living together when the FL is targeted so the ML can protect her and both MLs have a special ability relating to their senses (enhanced vision vs. hearing thoughts). Jin Han plays the ML in both dramas.

Both are fantasies about a love story between a dragon (FL vs. ML) and a human.
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Both are fantasies about a love story between a dragon (FL vs. ML) and a human.
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Both dramas have a writer FL and a ML who is the villain of her story. Both involve a sort of time travel (FL entering the fictional historical world vs. fictional historical ML entering the real world). Both couples are antagonistic at first.