Hello everyone!
I’m back with new OST Lyric translation. Frankly to say, this song is categorized as hardest OST lyric for me because it has too many phrases which I do familiar with (the Chinese) but hard to find words (in English) for it. For the example, the title of this song 逝言 Shi Yan, it can mean many and after searching for sometime, I decided to translate it as Pledge after checking 逝言 definition in Chinese and trying to find the most suitable word in my opinion.
Put aside the level of difficulty of this song, I really like this song because it has beautiful lyric and I feel touched. Again the translation might not 100% accurate, if you find mistake in my translation, please correct me.
Pledge (逝言)
Allen Ren (任嘉伦)
春华秋实等着谁一回眸
Chun hua qiu shi deng zhe shei yi hui mou
Spring to autumn waiting for someone to look back
眷眷往昔只无言地颔首
Juan juan wang xi zhi wu yan de han shou
I just nodded silently for the past familiarity
你要的爱随枯黄叶落
Ni yao de ai sui ku huang ye luo
The love that you want falling along the yellow leaves
我们往后的光景却已再难说
Wo men wang hou de guang jing que yi zai nan shuo
It is hard to talk about ours future
夏蝉冬雪任一季的斑驳
Xia chan dong xue ren yiji de ban bo
The autumn cicada and winter snow have cast off
再问世间情缘要何起落
Zai wen shi jian qing yuan yao he qi luo
For one more asking time when the fate begun and ended
就算拥有怎去深究
Jiu suan yong you zen qu shen jiu
Even I got the answer how to pursue
不执着若去留又会如何
Bu zhi zhuo ruo qu liu you hui ru he
If not persistent to stay then what would happen
让爱恨深锁
Rang ai hen shen suo
Love and hate have locked as one
却难放开手
Que nan fang kai shou
Hard to give it up
为何我转过身眼神才哀求
Wei he wo zhuan guo shen yan shen cai ai qiu
Why when I turned my back, my eyes showed imploring glance
最难的相守不过难割舍
Zui nan de xiang shou bu guo nan ge she
The hardest to stay forever as comparable to the most difficult as let go
当追忆渐冷
Dang zhui yi jian leng
When the memories get cooler
情长却难收
Qing chang que nan shou
The love is remaining long
为何抉择总在撕心裂肺后
Wei he jue ze zong zai si xin lie fei hou
Why after made the choices always gave heartbreaking
难道这逝言才是那永久
Nan dao zhe shi yan cai shi na yong jiu
Could it be by this way the pledge could last forever
夏蝉冬雪任一季的斑驳
Xia chan dong xue ren yiji de ban bo
The autumn cicada and winter snow have cast off
再问世间情缘要何起落
Zai wen shi jian qing yuan yao he qi luo
For one more asking time when the fate begun and ended
就算拥有怎去深究
Jiu suan yong you zen qu shen jiu
Even I got the answer how to pursue
不执着若去留又会如何
Bu zhi zhuo ruo qu liu you hui ru he
If not persistent to stay then what would happen
让爱恨深锁
Rang ai hen shen suo
Love and hate have locked as one
却难放开手
Que nan fang kai shou
Hard to give it up
为何抉择总在撕心裂肺后
Wei he jue ze zong zai si xin lie fei hou
Why after made the choices always gave heartbreaking
难道这逝言才是那永久
Nan dao zhe shi yan cai shi na yong jiu
Could it be by this way the pledge could last forever
让爱恨深锁
Rang ai hen shen suo
Love and hate have locked as one
却难放开手
Que nan fang kai shou
Hard to give it up
为何我转过身眼神才哀求
Wei he wo zhuan guo shen yan shen cai ai qiu
Why when I turned my back, my eyes showed imploring glance
最难的相守不过难割舍
Zui nan de xiang shou bu guo nan ge she
The hardest to stay forever as comparable to the most difficult as let go
当追忆渐冷
Dang zhui yi jian leng
When the memories get cooler
情长却难收
Qing chang que nan shou
The love is remaining long
为何抉择总在撕心裂肺后
Wei he jue ze zong zai si xin lie fei hou
Why after made the choices always gave heartbreaking
难道这逝言才是那永久
Nan dao zhe shi yan cai shi na yong jiu
Could it be by this way the pledge could last forever
消逝的诺言才是那永久
Xiao shi de nuo yan cai shi na yong jiu
Could it be disappearing promise last forever
azurro4cielo 
Thanks for the pinyin lyrics and English translation. It’s good. The title “Pledge” is spot on. Wikipedia should use that instead of “Death Words”.
The songs Allen sings for his drama are beautiful. The lyrics however are quite hard to follow. For example 心墙 for Under The Power and 荣耀 for Glory of Tang Dynasty.