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V said ‘I purple you’ because purple is the last color in the rainbow and he wants to say he loves you forever, but also wants to say he will never leave you, even if you are a complete pain in the ass.
V texts Jimin: ‘I purple you, even though you are a drama queen.’
V tweets: ‘I purple you, ARMY, even if you yell at me for 12 hours straight.’
V says to RM: ‘I purple you, even if you are the most annoying person on Earth.’