I think you may have questions about the MV, the song, or V.O.S, so here are some answers of them.

1. Cast?
- Main: 장순규(Jang SoonGyoo) (male) and 정서영(Jung SeoYoung) (female)
- Extra: V.O.S, and many people

2. Why are your romanization different from other sites' or forums' romanization?
That's because I follow our own way of making romanization rather than the original Korean Pronunciation's Rule.
For instance, "ㅓ" is "uh" (it is originally written as "eo" in Korea) and "ㄸ" is "dd" (it is originally written as "tt" in Korea)
"h" of "uh," "oh," "eh," or "ah" is used to help your pronunciation now.
Personally, I want you to notice that Korean "ㅂ" and "b" or "p" have not the same pronunciation, like "ㄹ" is not "r" nor "l".
So if you understand that it's just a Romanized Korean, thank you.
((+)) "g"(or "gh") is only "ㄱ"'s sound not "j"(ㅈ)'s.
"j" is used to show "ㅈ" but "ㅈ" sounds like between "j" and "ch".
"s"(or "sh") is not like the "s" of "see" so the sound of "s" is unaccented. I use "ss" for showing that it's more like "s" of "see".
For ㄲ(kk), ㄸ(dd/tt), ㅃ(bb/pp), ㅆ(ss), and ㅉ(jj), they are pronounced like ㅋ(k), ㅌ(t), ㅍ(p), ㅅ(s), and ㅊ(ch) often. Yes, you can follow singers' pron. but you have to know ㄲ, ㄸ, ㅃ, ㅆ, and ㅉ are just ㄲ, ㄸ, ㅃ, ㅆ, and ㅉ not ㅋ, ㅌ, ㅍ, ㅅ, and ㅊ.

I know that most of you can't pronounce "eu"(ㅡ) or "ui"(ㅢ) so accurately
but if you should practice pronouncing them again and again it'll be getting better.

3. What hyphens mean in your romanization?
For example, "nuh neun-ool" is there. It means that you can pronounce it as "nuh neu nool" (Prolonged) or "nuh neun ool" (Not Prolonged).
Likewise, "leel-uhp" can be pronounced as "lee luhp"(lee ruhp) or "leel uhp" as you please.

4. What parentheses mean in your romanization?
If one of syllables is like "(n)ee," it means that you can pronounce it as "nee" or "ee".

5. Can I get Korean lyrics of this song?
Here are Korean lyrics of this song.
[spoiler=Korean lyrics]
내 맘 들킬까 봐, 훤히 보일까 봐서,
애써 관심도 없는 척해
그저 장난처럼 괜히 던지는 말,
"난 너 여자로 안 보여"
한참을 멍하니 너의 옆모습 바라보다,
눈이 마주칠 때면 딴청 부리는 날 알까

정말 큰일이다,
자꾸만 보고 싶어서,
매일 네 생각만 나서,
아무 일도 할 수 없는데,
정말 큰일이다,
이러다 죽을 것 같은데,
너무 가슴이 아픈데,
난 어쩌라고, 넌 어쩌자고,
이토록 사랑하게 해

혹시 피할까 봐, 부담 가질까 봐서,
다가서기가 두려워져
마주 보는 일도, 곁에 서는 일도,
어색해지면 어떡해
차라리 나 혼자 오래 마음껏 바라볼게
슬픈 이별 같은 건 하지 않아도 되니까

정말 큰일이다,
자꾸만 보고 싶어서,
매일 네 생각만 나서,
아무 일도 할 수 없는데,
정말 큰일이다,
이러다 죽을 것 같은데,
너무 가슴이 아픈데,
난 어쩌라고, 넌 어쩌자고,
이토록 사랑하게 해

기적이라도 일어나
나를 한 번만 사랑해 주면 안 되니

(Oh, I need you)
(I just wanna be with U) 정말 다행이다,
나 먼저 널 사랑해서, (널-) (My Love)
나만 널 그리워해서,
이렇게도 힘든 일인데 (I love you, girl, -일인데)
정말 다행이다,
아프지 않아도 되니까,
너는 울 일 없으니까
그래, 그렇게 넌 웃기만 해
나만 혼자 아프면 돼

1. K.will is a Korean solo singer.
2. People say that he looks like DaeSung.
3. For the Korean word "네," when it means "you," Korean people usually pronounce it as "니" but it's wrong. I prefer you to pronounce it as "네" (as it is).