When the stairs were newly installed in Mijoo's house. she walked straight and didn't realize there were stairs.

“Ow! Ow ow ow” Was all she said until she ended up on the floor “WHAT THE HELL SOOJUNG?"

The second time she fell.

Soojung called out for her from the ground floor “Honey! Your favorite gay show is on!” 

“Wait for me babe—” Mijoo was about to step forward when she fell, again.

She rolled down the stairs and Soojung swore she heard some bones crack when Mijoo plopped on the floor a little too hard.

And the last time she fell before saying goodbye to the new stairs

Mijoo and Soojung's kids, Sujeong and Yein, we're playing downstairs silently then they decided to call their dad when Yein showed Sujeong some cool video in her phone

“Dad you have to come see this!” The oldest daughter called out. Mijoo rushed out of their shared room “Coming!” She stepped forward once again resulting to her falling to the third time in her life.

The kids watched horrified as their dad rolled down the stairs vigorously “Oh my gawd! Dad are you okay?!” Mijoo groaned “I'll stay here until the pain goes away.”

That was the last time they saw the long stairs, and Mijoo decided that she will just build escalators inside their house.