Story - 9.5 out of 10 stars, I loved the storyline, how the series told a past and present story of a 10-year old kid young Shin Jae-Woo saved by Kang Ji Hoon from the kidnapper/murdered. 15 years later, the history repeated again, (thus the title "Once Again") for the 25-year old Shin Jae-Woo when he traveled back in time 15 years ago, that time when Kang Ji Hoon was still alive in that dormitory and the same events in the past also meant to take place. Kang Ji Hoon saw the future Shin Jae-Woo traveled in the past. The story was nearly 100% perfect and realistic although there are some unanswered questions that is lingering into my mind like the following:

1. Did Kang Ji Hoon anticipated his death in EP 6?, how did he remembered that he was already dead in those episodes?

2. How did Kang Ji Hoon revealed to Joo Hyung Jin that the 10-year old kid was the 25-year old Shin Jae-Woo in Room 308 who time traveled back to 15 years ago, when Shin Jae-Woo was actually 10 years old at that time? (Hoping for a special episode to fill in those gaps). I think there was an event from the past 15 years ago that was changed.

3. How did Joo Hyung Jin still recognizes/remembers Shin Jae-Woo, The "Room 308 guy" he calls, 15 years after Kang Ji Hoon's death? Did he knew that 25-year old Shin Jae-Woo time traveled back to the past to save his friend? I think there was an event from the past 15 years ago that was changed. I mean 15 years is quite a memory storing moment, I bet Joo Hyung Jin would not recognize the 25-year old Shin Jae-Woo as the 10-year old kid grew up who admired his Ahjussi Kang Ji Hoon. It started to make sense why the dormitory woman still recognizes the good-looking guy in Room 308 15 years after January 30, 2007. (Related to my questions above)

Acting - 10 out of 10 stars, I was impressed by the emotions of Kang Ji Hoon and Shin Jae-Woo in the story. The most touching of all are the following:

1. When Kang Ji Hoon realized that the 25-year old Shin Jae-Woo in Room 308 was the 10-year old kid whom he saved from the kidnapper/murderer through the photo given by Joo Hyung Jin to Shin Jae-Woo and when he realized that the 25-year old Shin Jae-Woo felt the guilt of his death and time traveled, still Kang Ji Hoon did not change the outcome of the past when he saved 25-year old Shin Jae-Woo for the 2nd time. (Reality: Indeed you cannot change the past but you can change the outcome of the present and the future)

2. When 25-year old Shin Jae-Woo revisited the site of the murder during his time travel (EP 4) and the last will of Kang Ji Hoon gave to him through Joo Hyung Jin, 15 years after his death. He tried to change the outcome of the future but then Kang Ji Hoon was meant to sacrifice his life for the 10-year old Shin Jae-Woo. Really impressed by the out-pour of emotions portrayed by Kang Ji Hoon and Shin Jae-Woo.

Music - 10 out of 10, the OST of the song was really touching, I felt the song soo much.

Rewatch Value - 10 out of 10, even though it had a sad ending (although I already expected it), I will definitely rewatch this a thousand times due to the storyline, the emotions portrayed and the life lessons that the series imparted to us.

I just realized that our life in this world was only borrowed to us, this series provided a realization to me, we always learn to value what we loved so much, whatever the past (painful memories) that haunts us, we always learn to move forward for the betterment of the present and the future. Although we cannot change the outcome of the past, we always have the power in our hands to change the present and the future.