"! That's Anna?!" Nayeon exclaimed, she's too shock and confused to process things "Yes babe, that's Anna and I told you, she looks exactly like Sana" Jeongyeon replied. Nayeon got silent and thought for awhile before she took her bag and get her purse "Maybe she's the lost sister of Sana" Nayeon said and gave a photo to Jeongyeon. Her girlfriend's eyes were wide open "S-so Sana and A-Anna are sisters?".

"I need to confirm that one but, her mom told me a story before back when we visited Japan last year".

Flashback

 Sana is currently sleeping inside her room and since Nayeon woke up first, she went out of Sana's room and went to the living room where Sana's mom is. Mrs. Minatozaki turn around and smiled upon seeing Nayeon "Have a seat dear", Mrs. Minatozaki took some matcha tea and served it to Nayeon "How was your flight? Tiring?". 

Nayeon nodded her head as she sip the tea, a sigh escaped her lips as the warmth of the beverage hit "It was but finally we got to visit Osaka" she replied, Nayeon saw a pile of pictures beside Mrs. Minatozaki. She fought the urge to ask but Nayeon is a curious bunny "Auntie, what's that?". 

Mrs. Minatozaki sighed and took a photo album and showed it to Nayeon. went open upon seeing the pictures wherein, Sana is wearing a blue dress and beside her is also a kid who looks exactly like her but she's wearing a red dress.

"Sana has a twin sister, her name is Anna" Mrs. Minatozaki longingly caress the picture "We were struggling that time and planned on giving Anna away but we couldn't" tears started to drop from her eyes as she tries to remember everything, she feels ashamed for opening this to Nayeon but she knows that Nayeon is the right person to know everything and besides, she's Sana's bestfriend.

"Then one day, we decided to take them for a short trip but-" Nayeon patted her back "-but something bad happened when our