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The story centers on a "misunderstanding-to-reality" arc where Dal-mi believes Do-san is her childhood pen pal (who was actually Ji-pyeong writing under Do-san's name). As they enter Sandbox to launch their startup, they face cutthroat competition, technical hurdles, and a complex love triangle. Where to Watch

(Nam Joo-hyuk): A struggling math genius and founder of Samsan Tech who becomes Dal-mi's business partner. Seutateueob

(Bae Suzy): An ambitious woman with dreams of becoming Korea’s Steve Jobs despite not having a college degree. they face cutthroat competition

(Kang Han-na): Dal-mi's estranged older sister, a wealthy CEO who tries to succeed on her own terms. Plot Summary Seutateueob