Apparently Jack was not happy after he went back to the city.  Maybe he wants to 逃避?  

Or 內疚?Or something really bad which happen on him?

Just wonder why Hurley went to see Sun and her baby so sercertly? Because they doesn't want the media know Sun was pregnant on the island?  

why you think the Sun doesn't want the media to know she's pregnant?  What can be bad to her if the media knows?

In Season 4 Episode 12's Oceanic 6 press conference....one of the Koera reporter asked Sun....Is your husband (Jin) is one of the people who die on the island?  And she answered "NO".  She said Jin never made it off the plane.   

我惗如果佢話被傳媒聽佢有咗，咁積係代表Jin都曾經係生還者之一。咁啲記者又會問長問短，隨時講錯嘢。咁不如講Jin一開始就死咗，佢又無BB...之後佢就可以同BB安靜咁生活。（無人再追問，咁就唔會爆錯大鑊啦）

I just find out there have few secret ending for season 4:  http://www.youtube.com/watch?v=DWWMYFAycmQ

I SEE!!!!!!!!!  That explains it!  It makes sense!

Haha.. interesting!  I didn't know they have alternative endings!

忽然想提出一個可能係白痴無聊但又無人提出過嘅問題（可能根本無答案，我只係想發揮下想像力）：有無諗過LOST個島究竟存在響一個什麼空間狀態下呢？我唔係問location。點解一直都搵唔到佢哋呢？