Something to add up:
1. Wonjin added Hyeongjun with a heart because he has a crush on him. Hyeongjun still thinks they aren't friends.
2. The box Wonjin sells for $20 is half of the box Hyeongjun gives him. Out if it he makes: 2 small size, 1 medium size and 1 big size.

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[C] Our Gravity (Wonjin/Hyeongjun)
FanfictionLiving in a two-planet world with dual gravity, Wonjin, a teenager from Down Below meets Hyeongjun, a kid from Up Top.