"Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it." -Matthew 7:14

Guomen, 過門/过门, meaning marriage in Chinese. If explained literally, it means going past the gates/door-a reference to the Bible(see above).

"Through the Strait Gates": to me, it's the best way to explain it.

The gate's narrow, the road small for them.

Their past and future interwoven into a tangled, messed up web.

Thirteen years of sour and bittersweet memories. And seven years in between that washed out everything they had like water, leaving only stark, plain, throbbing dullness.