@Cards Team
So about that three way trade above, as it may seem strange...
Rand wanted a Red Velvet card and knew gayzone had a Yeri in exchange for IZ*ONE (but not sacrifice one of his own). I was able to get an IZ*ONE card for gayzone that Rand already had. Rand would give me Yeojin in return for helping him out.
So, I can't trade directly with Rand as he can't hold 2 Nako cards, and I couldn't trade directly with gayzone as I can't hold 2 Yeri cards. Thus, this 3-way trade of just handing over the cards... This has been my TED talk on the complications of not being able to hold duplicate cards for trading (which is a good idea/rule by the way).

