Correct

好心当做驴肝肺

/ hǎo xīn dàng zuò lǘ gān fèi / 
Strokes
https://i.cchatty2.com/filters:format(webp)/fit-in/684x0/img/202102/好心当做驴肝肺-Chinese-idioms-Cchatty-5ac1c0cb-5d71-4eb6-b7c7-6a43cb1afb85-1612776902.jpg

Collocation

1
把……(某人)的好心当做驴肝肺
2
真是好心当做驴肝肺

Definition

好心当做驴肝肺

Literally means:

take a kind heart for a donkey's liver and lungs

Actually means:

mistake a favor for ill will

A donkey's liver and lungs figuratively means ill will. The phrase means taking somebody's good will for ill intent. It usually connotes a sense of complaint.

驴肝肺,比喻坏心肠。把别人的好心当作恶意通常含有埋怨的意思。

Example

Used as predicate or a minor sentence, and can have other words in between. (作谓语、小句,中间可插入别的词语)
1
Lǎotóur  
老头儿
shēn
深
xī
吸
yīkǒuqì
一口气
  
,
mànmànr  
慢慢儿
shuōdào
说道
  
:
féng
冯
lǎodì
老弟
  
,
wǒ
我
kěshì
可是
yī
一
pān
番
hǎoyì
好意
  
,
nǐ
你
biè
别
bǎ
把
hǎoxīn
好心
dāngzuò
当做
lǘgānfèi
驴肝肺
le
了
  
。

The old man took a deep breath and said slowly, "Feng brother, I am a kind man, don't take kindness as a donkey liver and lungs."

2
Tā
她
kǎoshì
考试
méiyǒu
没有
kǎo
考
hǎo
好
  
,
wǒ
我
qù
去
ānwèi
安慰
tā
她
  
,
tā
她
fǎnér
反而
shuō
说
wǒ
我
shì
是
cháoxiào
嘲笑
tā
她
  
,
zhēnshi
真是
hǎoxīn
好心
bèi
被
dàngzuò
当作
lǘgānfèi
驴肝肺
le
了
  
!

She didn't do well in the exam, I went to comfort her, she said I was laughing at her, really kind as a donkey liver lung!

3
Tāmen
他们
de
的
shì
事
biéren
别人
shì
是
nòng
弄
bu
不
qīngchǔ
清楚
de
的
  
,
nǐ
你
háishi
还是
bié
别
guǎn
管
tāmen
他们
le
了
  
,
bùrán
不然
tāmen
他们
huì
会
bǎ
把
nǐ
你
de
的
hǎoxīn
好心
dàngzuò
当作
le
了
lǘgānfèi
驴肝肺
  
。

Their affairs are not clear to others, you still leave them alone, or they will treat your kind as a donkey liver and lungs.