They have

You were Han's girlfriend... you met in Tokyo at a small shop... and so you became friends and then sweethearts... almost united by a ring... but sadly, during a race, he "died" when his car... the Mazda RX-7, collided with another and exploded...

You were devastated... you never found anyone else... no one like him... every night was harder... but it hurts to know... that you've gone one step further... on his path of love... and that he's going to leave without reason or motive, your heart tells you so...

It's easy for him to abandon you, taking your feelings with him... taking... your feelings... Everything changed until... one day... (obviously a few years had passed since then...), it was an afternoon... the gang was gathered... and you were laughing and joking with Dom...

Just then... Mia and Letty arrived... and a girl, apparently a new member... and behind them... Han, yes... Han Lue... the boy who ruined your feelings... Han walked in while sampling some of his favorite snacks and said...

Han Lue: "Nice house, Club..."

You were in shock, just like everyone else... all this time... you thought he was dead... but he was right now, STANDING RIGHT IN FRONT OF YOU!!!

In short, he faked his death.