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In both dramas there are time travel to be able to save and win the first love.
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Both dramas deal with time travel / time slip.
Manhole(2017) - Male main lead Bong Pil time travels into the past through a manhole in an effort to stop the wedding of his lifelong crush, Soo Jin, set to happen one week into the future. whereas in
Blue Birthday (2021) - Female main lead Oh Ha Rin will revisit the past through mysterious photos left by her first love, Ji Seo Jun, who died on her birthday 10 years ago, and prevent his death. (for every time travel the person needs to pay a price )
Manhole(2017) - Male main lead Bong Pil time travels into the past through a manhole in an effort to stop the wedding of his lifelong crush, Soo Jin, set to happen one week into the future. whereas in
Blue Birthday (2021) - Female main lead Oh Ha Rin will revisit the past through mysterious photos left by her first love, Ji Seo Jun, who died on her birthday 10 years ago, and prevent his death. (for every time travel the person needs to pay a price )
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![](https://i.mydramalist.com/1Rm5b_4t.jpg)
![](https://i.mydramalist.com/2dWREt.jpg)
![](https://i.mydramalist.com/elgEet.jpg)
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![](https://i.mydramalist.com/6QDqWt.jpg)
![](https://i.mydramalist.com/l0ENJt.jpg)
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